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The earliest known citation index is an index of biblical citations in rabbinic literature, ... PubMed, which covers life sciences and biomedical topics, and;
An Iranian index of academic journals and access to full text or metadata Free Scientific Information Database: SCIndeks - Serbian Citation Index: Multidisciplinary: 80,000 A bibliographic database, a national citation index, an Open Access full-text journal repository and an electronic publishing platform. Articles from >230 journals. Free
As of 23 May 2023, PubMed has more than 35 million citations and abstracts dating back to 1966, selectively to the year 1865, and very selectively to 1809. As of the same date [update] , 24.6 million of PubMed's records are listed with their abstracts, and 26.8 million records have links to full-text versions (of which 10.9 million articles are ...
PubMed Central is a free digital archive of full articles, accessible to anyone from anywhere via a web browser (with varying provisions for reuse). Conversely, although PubMed is a searchable database of biomedical citations and abstracts, the full-text article resides elsewhere (in print or online, free or behind a subscriber paywall).
medRxiv is indexed by Crossref, Google Scholar, Semantic Scholar, Europe PubMed Central and Web of Science's Preprint Citation Index. In addition preprints reporting research funded by the National Institutes of Health are indexed by PubMed .
Index Medicus (IM) is a curated subset of MEDLINE, which is a bibliographic database of life science and biomedical science information, principally scientific journal articles. From 1879 to 2004, Index Medicus was a comprehensive bibliographic index of such articles in the form of a print index or (in later years) its onscreen equivalent.
The journal is abstracted and indexed in MEDLINE, PubMed the Arts and Humanities Citation Index, Applied Social Sciences Index and Abstracts, Worldwide Political Science Abstracts, CINAHL, Current Contents/Social & Behavioral Sciences, Excerpta Medica, Philosopher's Index, PsycINFO, Science Citation Index Expanded, Social Sciences Citation Index, and Psychological Abstracts.
Index Medicus/MEDLINE/PubMed Science Citation Index Expanded According to the Journal Citation Reports , the journal has a 2021 impact factor of 6.107, ranking it 42nd out of 143 journals in the category "Cardiac & Cardiovascular Systems".