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Journal Citation Reports (JCR), the only source of citation data on journals, is a database produced by ISI Web of Knowledge for journal impact factor data. You can view journal rankings by selecting categories.
Directory of Open Access Journals (DOAJ) is a community-curated online directory that indexes and provides access to high quality, open access, peer-reviewed journals. All data is freely available. You can browse subjects to find open access journals for Medicine by using limiters: Journals and DOAJ Seal. The DOAJ Seal is a mark of certification for open access journals, awarded by DOAJ to journals that achieve a high level of openness, adhere to Best Practice and high publishing standards.