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Table 2 Types of documents from the PMC open access subset

From: Using cited references to improve the retrieval of related biomedical documents

Document type # Documents PubMed coverage (%)
research-article 202520 99.5
review-article 17962 98.9
case-report 8854 98.5
letter 3268 90.5
Editorial 2921 95.3
other 13583 85.2
TOTAL 249108 98.4