PubMed Central (PMC) is a free digital archive of full-text scholarly articles in the biomedical and life sciences, maintained by the U.S. National Institutes of Health’s National Library of Medicine.

The Directory of Open Access Journals (DOAJ) is a communit y-curated online directory that indexes and provides access to high-qualit y, peer-reviewed open access journals from around the world.

The Cochrane Library is a collection of databases that provides high-quality, independent evidence to inform healthcare decision-making.

BioMed Central (BMC) is a UK-based, for-profit open access publisher of over 250 peer-reviewed scientific journals.

The Public Library of Science (PLOS) is a nonprofit open access publisher that aims to accelerate progress in science and medicine by publishing a collection of peer-reviewed journals.

The Multidisciplinary Digital Publishing Institute (MDPI) is a Swiss-based, open-access academic publisher that publishes a large portfolio of peer-reviewed scientific journals.

The British Medical Journal (BMJ) is a peer-reviewed medical trade journal published by the British Medical Association

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