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- National Institutes of Health (U.S.). PubMed Central[remove]3
- National Institutes of Health (U.S.)2
- Bibliometrics.1
- Clinical and Translational Science Awards (Program)1
- Database searching.1
- Howard Hughes Medical Institute1
- Open Archives Initiative1
- Open access1
- Open access publications1
- Open access publishing.1
- Public Library of Science1
- Reed Elsevier (Firm)1
- Scholarly electronic publishing.1