The databases below are free to search. Retrieve full-text articles in PubMed Central.
Access full-text articles freely in PubMed Central® (PMC), a full-text archive of biomedical and life sciences journal literature at the U.S. National Institutes of Health's National Library of Medicine (NIH/NLM. PMC makes all content free to read as NLM believes that the best way to ensure the accessibility and viability of digital material over time is through consistent and active use of the archive.
ClinicalTrials.gov is a registry and results database of publicly and privately supported clinical studies of human participants conducted around the world.
Use reference management tools to help capture, save and organize your biographic citations and references.