Basic Searching in Embase Using Emtree Terms to Search Embase. Note: If the ..sv command is used to save a search with a name that is already in use for a search, it will overwrite the first search without warning. Step 10. Optimal search strategies
2006 Jun;6:67. Phrases surrounded by single quotes. Different databases use different search syntax, operators, and default search fields. Searching Emtree for subject headings Go the Embase home page and click on Emtree Enter a term in the search box (here - asthma) and add the term to your search as follows. Search for your institution and click the name to login. We used the Ovid (Ovid Technologies, www.ovid.com) interface for EMBASE and the Ovid search syntax to test all filters. Free full text link: http://www.biomedcentral.com/content/pdf/1741-7015-3-7.pdf, Wilczynski NL, Haynes RB, for the Hedges Team. The Advanced Search allows you to construct more precise searches by using Medical Subject Headings (MeSH) and subheadings. Free full text link:
They often include a container element like square brackets or colons and abbreviations. exp methodology
Searching Embase: Easy keyword searching and automatic mapping to MeSH terms. Syntax for this operator is as follows: "x.fd./freq=n", where x is the query, fd is the 2-letter field name, and n is the threshold frequency. Embase supports the Boolean and proximity operators AND, OR, NOT, NEAR and NEXT. depression NOT tricyclic. 2007 Jan;60(1):29-33. An overview of Embase field codes is presented in the tab Search Fields in Embase (See box: Search fields). Enter a super search code to execute a search in one or more fields that may contain the desired information. Improving Textword Searching . This means the search engine on the fly ignores the following stopwords: and, as, for, from, is, of, that, the, this, to, was, were. Several fields are available for exact searches; these command-line searches work from the Results page search box: de (exact Emtree term, no explosion) Example: 'hyperthyroidism'/de, exp (exact Emtree term, exploded) Example: 'hyperthyroidism'/exp, mj (exact Emtree term, as a major focus in article) Example: 'hyperthyroidism'/exp/mj, au (exact author name) Example: 'smith j'/au, jt (exact journal title) Example: 'american heart journal'/jt, ta (exact journal abbreviation) Example: 'am heart j'/ta. J Clin Epidemiol. 2005 Jul-Aug;12(4):481-5. OR exp methodology
Developing optimal search
Systematic searching ≠ Doing a systematic review Systematic reviews need systematic searche (r)s but: The systematic approach can be used for more than just searching systematic reviews Performing systematic reviews is more than just searching systematically 5. The asterisk cannot be used with fewer than two characters; for best relevance, type at least three characters before truncating with *. EMBASE Pollution & Toxicology is a bibliographic database that includes abstracts and citations concerning pollution and toxicology, built entirely from the EMBASE Specialties Series databases. exp disease course
Embase (often style While its Basic Search runs on Natural Language Processing, Advanced Search uses command-line syntax and notation. catheter? You are taken to a display of subject headings that best match your search term. OR index.tw. Identify most relevant emtree terms and free text words 2. Several fields are available for exact searches; these command-line searches work from the. Search Strategies for PsycINFO in Ovid Syntax PsycINFO. Combining Search Lines the following data are shown: Maximized sensitivity, Maximized specificity, Best
random:.tw.
1. OR exp health care organization
Hooijmans CR1, Tillema A, Leenaars M, Ritskes-Hoitinga M. Enhancing search efficiency by means of a search filter for finding all studies on animal experimentation in PubMed. Use the Scope information icon to find out the definition and coverage of a heading. Some databases will find the exact word or phrase, so make sure your spelling is accurate or you will miss references. Desde el pasado 31 de enero de 2016 disponemos de una opción de búsqueda PICO en EMBASE.com que ya anunciamos en biblioGETAFE (Búsqueda PICO en EMBASE).Recientemente, el 24 de junio de 2016, han mejorado el formulario de búsqueda PICO incluyendo el campo de diseño de estudio (o varios) de campo, lo que permite búsquedas de medicina basada en la evidencia más estructurados. is not supported with field limits: If you continue with this browser, you may see unexpected results. OR ep.fs. Embase search syntax (Embase.com). Ovid will now run your search on this new database, ready for you to check and correct. We then used a computer-generated algorithm to combine single terms into complex search filters and compared the ability of all developed filters to retrieve articles with dialysis information. "physic* fit*", And you can use the asterisk to truncate a phrase in combination with field limits: OR diagnostic.tw. Optimal search strategies
Sixty topic areas are covered, including thirty core clinical and pharmacology topics that represent over 70% of Embase content. You are taken to a display of subject headings that best match your search term. Embase is a highly versatile, multipurpose and up-to-date biomedical research and literature database. 4. sensitiv:.tw. Adapt Search Syntax for Different Databases. Walters LA, Wilczynski NL, Haynes RB, for the Hedges Team. BMC Med
To get the correct syntax, search within Emtree (Embase thesaurus), then "Add to Query Builder", then use the options below the search box to filter for date range etc. Formally, EMDP and EMPS are considered to be subsets of EMBASE. PsycINFO strategies were derived using a 64-journal subset.To view the PsycINFO strategies, click on the relevant article category (therapy, review, qualitative).To view the search filters for EMBASE and MEDLINE, please click on the appropriate link. This type of searching is also applicable to Embase, PsycINFO & AMED although these databases use different Subject Heading systems with differing functionality. Super search fields facilitate crossfile and multifile searching. Which is a database that has its own platform (Embase.com). validation.tw. OR validat:.tw. For each purpose category (Therapy, Diagnosis,
If you have already searched Medline/PubMed you can exclude Medline results from your Embase search by including the NOT [medline]/lim in the search strategies below.. 1. •To know how to search Embase. As the aim of a systematic literature search is to find as much published evidence as possible, it is advisable to first consider if searches limited to one database, i.e.
are likely to be used). The Ovid search engine applies ‘run-time stopword processing’. Creating an optimal syntax in embase.com (Agenda for this webinar) 1. OR sensitivity analys:.tw. - Basic, natural language as well as command-line search syntax functionality - Multi-file searching across books, journals, and up to 150 database segments at a time - Comprehensive and well-organized Search History, located on same page as search results, allows users to edit and annotate - Unique Ovid MEDLINE field - Multipurpose (MP) depression AND tricyclic, OR – At least one word or phrase must be present; this example searches for records containing any one of these three words: Embase has over 32 million records, including articles from 7,600 peer-reviewed journal titles. cost effectiveness analysis.sh. References for the methods
Sixty topic areas are covered, including thirty core clinical and pharmacology topics that represent over 70% of Embase content. It would be difficult to replicate the search without knowing which platform was used and what syntax to apply to the search. You can combine Boolean operators and use parentheses to create complex single search statements: (aged OR elderly OR geriatric) AND (depression OR insomnia), (symptom* NEAR/5 (headache* OR ‘head ache’)):ti,ab. EMBASE search strategies for identifying
Best first place to search for. OR prognos:.tw. balance of sensitivity and specificity . J Am Med Inform Assoc. Using the New PICO search Form [Video from Embase.com](MP4 requires media player). field code in MEDLINE (to find author keywords); this is .kw. The original search strategies used in Embase and MEDLINE were modified in four ways: (1) by searching Embase thesaurus terms as major descriptors, (2) by removing thesaurus terms from the Embase search such that only terms were searched in the title and/ or abstract fields, (3) by searching both MEDLINE and Embase for major thesaurus terms, and (4) by searching both MEDLINE and Embase … 2005 Mar 22;5(1):8. Embase is a large biomedical and pharmaceutical database that contains Medline/PubMed content within it.It is an essential source for all clinical research on coronavirus. Or choose your institution's region or group and click the name from the results below to login. Optimize the syntax to identify missing terms 6. The objective of this study was to develop search strategies that optimize the retrieval of methodologically sound diagnostic studies from EMBASE for use by clinicians. Scopus searches focus on abstracts and citations, while a search in Embase provides additional insights as a result the structured full-text indexing of content. A more unusual example is Embase. Especially strong coverage on drug trials. Not all databases use the same syntax. This means the search engine on the fly ignores the following stopwords: and, as, for, from, is, of, that, the, this, to, was, were. The Ovid search engine applies ‘run-time stopword processing’. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. Step 10. symptom NEAR/5 headache, NEXT/n – Must be within n words of each other. Embase is a biomedical and pharmaceutical database, which is particularly useful when you need to conduct a systematic review or search for topics on food/diet/nutrition topics, medical devices, or drugs. OR placebo:.mp. One major exception is the .kf. interview:.tw. http://www.biomedcentral.com/1472-6947/5/11, Search Strategies for EMBASE in Ovid Syntax. This series of quick, simple screencasts is designed to guide you through searching comprehensively in Ovid Embase. Search Strategies for EMBASE in Ovid Syntax EMBASE To develop search filters in EMBASE, we assembled a list of search terms and phrases in a subset of EMBASE records matched with a hand search of the contents of 55 of the 135 journals titles indexed in the year 2000. sul*ur retrieves sulfur, sulphur. Overall, EMBASE provides twice as many citations per search as MEDLINE and provides greater coverage of total retrieved citations. There are no spaces in this command. To search by word, Embase mostly uses the same field codes as MEDLINE, so searches by word in MEDLINE can be copy-pasted to Embase. http://www.biomedcentral.com/1472-6963/6/67, Wong SSL, Wilczynski NL, Haynes RB. 2010 Jul;44(3):170-5. doi: 10.1258/la.2010.009117. Command-line syntax includes the use of boolean operators, nesting, and combining sets as above.
OR clinical trial:.mp. Developing optimal search strategies for retrieving clinicallly relevant qualitative studies in EMBASE. Search Fields provides you with the option to search within specific fields of a database record (e.g. PubMed. Adapt Search Syntax for Different Databases. Command-line syntax is displayed on the Results page, letting you see exactly how your search was executed: You can use command-line syntax to enter a search in full in the search box on most of the search forms (although in practice shortcuts such as limits, mapping to preferred terms, etc. OR search:.tw. The Embase thesaurus, Emtree, includes over 5,500 medical device terms; A dedicated medical device search form and device subheadings that show relationships to related terms (e.g., adverse device events, device comparison, device economics) please click on the appropriate link.To find out more about the Hedges Project click here. Embase search with PICO 1. 2. No subheading selection. You can use them in any search form, including Quick Search. Table of Contents and Menu available within the tutorial. When using “near”, although search terms are not kept in the specified order, instances where the search terms are in specified order are prioritised in the search results, i.e. This is a search optimised for the Medline database on the Ovid platform. 2006 Jun;6:67. Embase allows you to build comprehensive systematic reviews so that you can thoroughly study all of the published literature on a particular topic and make the best-informed evidence-based medicine decisions. If no other operator is specified, AND is the default operator; heart failure is searched as heart AND failure if not enclosed in quotation marks. The number of results include double titles. Biomedical terms are organized by broader and narrower terms for most subjects; Emtree subject headings will retrieve most associated synonyms for … NEAR/n – Must be within n words of each other. OR exp epidemiology. Prognosis, Reviews,
It also includes the use of field labels to qualify your terms to specific fields. 5. Restrict to specific fields by using a colon (:) followed by the two-letter label. Searching with Emtree Subject Headings . "physic* fit*":ab,ti. Indexing vocabulary terms from subject-specific databases like EMBASE, MedLine or Compendex are also included in the Keyword search. OR double-blind:.tw. In Embase you can use truncation (also refererred to as "wildcards") to find alternative spellings within words. Embase is a biomedical database that focuses on drugs and pharmacology, medical devices, clinical medicine, and basic science relevant to clinical medicine. search strategies achieved high sensitivity and specificity for retrieving methodologically
Search sets can also be nested with parentheses: You can use the field code :cn to search by clinical trial number, or just use the number. 3. OR diagnos:.mp. Free full text link: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1174893/?tool=pubmed, Haynes RB, Kastner M, Wilczynski NL; Hedges Team. 1. clinically sound treatment studies in EMBASE. If you have already searched Medline/PubMed you can exclude Medline results from your Embase search by including the NOT [medline]/lim in the search strategies below.. 1. Embase is a highly versatile, multi-purpose and up-to-date biomedical database. 3. OpenAthens login. Search syntax Different databases use different search syntax, operators, and default search fields. EMBASE Pollution & Toxicology is a bibliographic database that includes abstracts and citations concerning pollution and toxicology, built entirely from the EMBASE Specialties Series databases. You can use truncation characters within phrases: Use the asterisk to replace one or more letters: You can use truncation characters within phrases: And you can use the asterisk to truncate a phrase in combination with field limits: However, the use of ? Restrict to specific fields by using a colon (:) followed by the two-letter label. However, the use of ? This example retrieves records with at most 4 words between terms, in either order: OR economic.tw. LEMBASE (Embase™ Learning Database) March 2017 . "heart infarct*" OR cohort.tw. Embase (embase.com interface) CENTRAL CINAHL (EBSCOhost interface) Web of Science Scopus US oriented bibliographic database which includes all aspects of clinical medicine, biological sciences, education and technology European oriented bibliographic database that covers similar topic to … Subheadings can be searched alone, unattached to a specific term (free-floating), using lnk: 'graves disease'/exp AND 'drug therapy':lnk. interview:.tw. 2005 Mar 29;3(1):7. Causation [etiology], Economics),
strategies for detecting clinically sound and relevant causation studies in EMBASE. This video demonstrates how to translate a search strategy from PubMed to CINAHL and Embase. More citations do not necessarily mean higher-quality citations. For a range: #8 AND [1990-2016]/py, Since specific date: #8 AND [03/01/2015]/sd. You can use command-line syntax to enter a search in full in the search box on most of the search forms (although in practice shortcuts such as limits, mapping to preferred terms, etc. Registration is available: From within your associated institution’s IP range; If you first log in with your original EMBASE credentials Creating an optimal syntax in embase.com (Agenda for this webinar) 1. Use the Scope information icon to find out the definition and coverage of a heading. ..sv ps(x) Saves search strategy permanently with name x. random:.tw. OR model.tw. Results may be limited to reviews and full text. Health Science Database Tutorials. follow-up.mp. All these formats should work: Clinical trial numbers have been indexed for Embase since 2007. BMC Med. Jan;94(1)41-7. Then copy the resulting output to your search strategy. However, all databases have a slightly different search interface and offer slightly different search options. In the third column of the table: sens = sensitivity; spec = specificity; prec =
Saves search strategy temporarily (24 hours) with name x. for detecting cost and economic studies in EMBASE. meta-analys:.mp. are likely to be used). To search for a phrase, be sure to use single or double quotes around the phrase, or hyphens: "heart failure" or 'heart failure' or heart-failure. Wilczynski NL, Haynes RB, for the Hedges Team. searchterm:ti,ab,de to look for words in the titles, abstracts or descriptors, ORed with Emtree terms qualified with either :de if you don’t want the term exploded (‘exploded’ meaning narrower terms beneath a term in the subject lists are included), or /exp if you do want to include narrower terms. OR search:.tw. •To know how the EMTREE thesaurus is organised. If there is no subject heading to match your search terms you can search by keyword instead. to qualify your terms to specific fields. The Advanced form lets you map to Emtree terms, and contains options to limit your search by date, source (Embase or MEDLINE), field label, evidence based medicine, publication types, language, gender, age, human/animal. Since Scopus does not use Emtree to facilitate synonym mapping and hierarchical searches, it may retrieve significantly fewer results than Embase. prognos:.tw. detecting clinically sound prognostic studies in EMBASE: an analytic survey. 2006 Jun;6:67. For each database you search, the structure of the search strategy remains the same. are likely to be used). The distance of one word in between is kept, but the stopword ‘for’ is ignored. So, a search like: at risk for diabetes.ti will also find: at risk of diabetes. However, many scientists are often unaware of the structural and content-related differences between both databases. OR prediction.tw. OR specificity.tw. OR review.pt. Search Translation Resources Search line 2 limits results to animal only studies and search line 3 then excludes these from the results when combined with your search terms. Free full text link:
2) exp animals/ not humans.sh. OR survival.tw. The Editor (ED) field contains the list of editors associated with the article. Truncation (*) works within phrases. OR outcome.tw. McMaster Health Knowledge Refinery (McMaster HKR) Projects, CLARITY and EBCP (Evidence-Based Clinical Practice Workshop), Users' Guides for Evidence-Based Practice, http://www.biomedcentral.com/1472-6963/6/67, http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1324770/?tool=pubmed, http://www.biomedcentral.com/content/pdf/1741-7015-3-7.pdf, http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1174893/?tool=pubmed, http://www.biomedcentral.com/content/pdf/1472-6947-5-8.pdf, http://www.biomedcentral.com/1472-6947/5/11, Best balance of sensitivity and specificity, Copyright © 2004 - 2020 • Health Information Research Unit • Last modified February 9, 2016. One major exception is the .kf. validat:.mp. Embase includes a growing list of more than 22 million bibliographic records spanning 1974-present. Emtree is a list of subject headings unique to Embase. conduct a comprehensive search in Medline & CINAHL using both subject headings and keywords. Limit by date by using the field label py (publication year) or sd (since date). sul?ur:ab,ti retrieves an error message. Embase has two truncation characters: * and ? Qual Health Res. 3) 1 not 2 . BMC Med Inform Decis Mak. When translating a search strategy from one database to another, you will have to make some changes to get comparable results. •To practise searching Embase (and Medline). It covers the most important international biomedical literature from 1947 to the present day and all articles are indexed in depth using Elsevier's Life Science thesaurus Embase Indexing and Emtree®. To view the search filters for
EMBASE
Search Translation Resources. It also includes the. Command-line syntax includes the use of … Introduction to Embase . 'Clinical Queries' allows searching for clinical trials, systematic reviews and medical genetics topics; Advanced Search offers guided mapping of keywords to MeSH terms An analytic survey was conducted, comparing hand searches of 55 journals with retrievals from EMBASE for 4,843 candidate search terms and 6,574 combinations. No subheading selection. cost effectiveness.tw. 4. AND – Both words or phrases must be present in the record; they do not have to be adjacent: Information included covers the detrimental effects of toxic substances and environmental pollution on plants, animals, and humans. The original search strategies used in Embase and MEDLINE were modified in four ways: (1) by searching Embase thesaurus terms as major descriptors, (2) by removing thesaurus terms from the Embase search such that only terms were searched in the title and/ or abstract fields, (3) by searching both MEDLINE and Embase for major thesaurus terms, and (4) by searching both MEDLINE and Embase … OR qualitative study.tw. Results may be limited to reviews and full text. 1) Your combined search terms. Search tip: to find information on AIDS in the context of public health/epidemiology, limit your search on AIDS using Embase section heading 17 (Public health, social medicine and epidemiology). If you are looking for a topic covered by a specific author, source, affiliation, etc. OR randomized.tw. As above Natural Language processing, Advanced search uses command-line syntax and.. 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Using Medical subject headings ( MeSH ) and subheadings remains the same them in any Form... Vocabulary terms from subject-specific databases like Embase, PsycINFO & AMED although these use... Clinically sound prognostic studies in Embase you can use truncation ( also refererred as... Use of field labels to qualify your terms to specific fields output to your search terms you can them. Of the search search for your institution and click the name from the results below to login: sensitivity. With field limits: if you continue with this browser, you will have to make some to... Platform ( Embase.com ), and default search fields ) search optimised for Hedges! The following data are shown: Maximized sensitivity, Maximized specificity, best random:.tw more... For diabetes.ti will also find: at risk of diabetes: an analytic.! Versions of Chrome, Firefox, Safari, and Edge field codes is presented in keyword. 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These formats should work: clinical trial numbers have been indexed for Embase search Translation Resources super search to! Cinahl and Embase of field labels to qualify your terms to search within specific.. Are looking for a range: # 8 and [ 03/01/2015 ] /sd the list of associated. ( to find author keywords ) ; this is a large biomedical and pharmaceutical database that contains Medline/PubMed within! Of diabetes author, source, affiliation, etc best first place to search for name from the results to...: ) followed by the two-letter label MEDLINE database on the Ovid search engine applies run-time. For diabetes.ti will also find: at risk of diabetes www.ovid.com ) for! Than 22 million bibliographic records spanning 1974-present place to search Embase Medical subject headings ( MeSH and! Vocabulary terms embase search syntax subject-specific databases like Embase, PsycINFO & AMED although these use... The same and combining sets as above to test all filters creating an optimal in! Are looking for a range: # 8 and [ 03/01/2015 ] /sd modern browsers such as the latest of. The latest versions of Chrome, Firefox, Safari, and default search fields provides with! Of editors associated with the option to search for match your search terms can... It would be difficult to replicate the search filters for Embase search strategies Sixty topic areas are,! Is also applicable to Embase Embase you can use them in any search Form Video. Video demonstrates how to translate a search like: at risk for diabetes.ti will embase search syntax:... Truncation ( also refererred to as `` wildcards '' ) to find out the definition coverage. Creating an optimal syntax in Embase.com ( Agenda for this webinar ) 1 for! Medline and provides greater coverage of a heading large biomedical and pharmaceutical database that has its own (. A container element like square brackets or colons and abbreviations have been indexed for Embase Ovid... The tab search fields knowing which platform was used and what syntax test! Often include a container element like square brackets or colons and abbreviations reviews it. All databases have a slightly different search interface and offer slightly different search and. Following data are shown: Maximized sensitivity, Maximized specificity, best random:.tw taken to display... Quick search it.It is an essential source for all clinical research on coronavirus, RB... Used and what syntax to apply to the search strategy remains the same NEXT/n – Must be within n of. Using both subject headings that best match your search term Maximized sensitivity Maximized!, operators, nesting, and Edge of Boolean operators, and Edge these formats work. Subject heading systems with differing functionality ) to find author keywords ) ; this.kw... May See unexpected results we used the Ovid search engine applies ‘ run-time stopword processing ’ specific. 8 and [ 03/01/2015 ] /sd headache, NEXT/n – Must be within n words each!, not, NEAR and NEXT using Emtree terms to search Embase some changes to comparable! To qualify your terms to specific fields of a heading, all databases have a slightly different syntax. Example retrieves records with at most 4 words between terms, in either order: or.. Syntax, operators, and Edge most relevant Emtree terms to specific fields display of headings... 44 ( 3 ):170-5. doi: 10.1258/la.2010.009117 to as `` wildcards '' ) to find keywords! Covered by a specific author, source, affiliation, etc any search [..., www.ovid.com ) interface for Embase search strategies for detecting clinically sound prognostic studies in Embase provides you with option. Does not use Emtree to facilitate synonym mapping and hierarchical searches, it may retrieve fewer! They often include a container element like square brackets or colons and abbreviations labels to qualify your terms search. Fields by using the field label py ( publication year ) or sd since... Medline database on the Ovid search syntax, operators, and default search fields in Embase: an analytic.! See box: search fields ) editors associated with the article a super search to! And Menu available within the tutorial relevant Emtree terms to specific fields of a heading Embase. Mapping to MeSH terms colons and abbreviations however, all databases have a slightly search! And click the name to login is kept, but the stopword ‘ for ’ ignored. Player ) using both subject headings that best match your search terms you can use truncation ( also to! Comprehensive search in one or more fields embase search syntax may contain the desired.! ), strategies for identifying best first place to search for your institution and click the name to login on. Retrieving clinicallly relevant qualitative studies in Embase represent over 70 % of content. Specific author, source, affiliation, etc match your search terms you can use (.: Maximized sensitivity, Maximized specificity, best random:.tw limited to reviews and full text sound and causation! Words between terms, in either order: or economic.tw Embase ( often style its. In one or more fields that may contain the desired information sd ( since date ) the name the... Biomedical database symptom NEAR/5 headache, NEXT/n – Must be within n words of each other clinically. Using the new PICO search Form [ Video from Embase.com ] ( MP4 media... From subject-specific databases like Embase, MEDLINE or Compendex are also included in the search. Which is a database that has its own platform ( Embase.com ), and! Field label py ( publication year ) or sd ( since date ) full text link::! It.It is an essential source for all clinical research on coronavirus risk for diabetes.ti will also find: risk! Rb, embase search syntax the Hedges Team and abbreviations of Boolean operators, and default search fields ) [ ]. For detecting clinically sound prognostic studies in Embase: Easy keyword searching and automatic to... Embase: an analytic survey clinical trial numbers have been indexed for Embase and the Ovid syntax. Headache, NEXT/n – Must be within n words of each other specific author, source affiliation... This example retrieves records with at most 4 words between terms, either... Core clinical and pharmacology topics that represent over 70 % of Embase and full link! Field limits: if you continue with this browser, you may See unexpected results of field labels to your. Of Chrome, Firefox, Safari, and combining sets as above author keywords ;! Institution 's region or group and click the name from the results below to login ) Saves search permanently! And up-to-date biomedical database these databases use different search options of total retrieved citations also refererred to as `` ''.