Information and research conducted by the federal government and international non-governmental organizations can be vital to your work, and is also usually free to read.
Portal to Government Research
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Science.gov
The results of federally funded science research: "more than 200 million pages of authoritative U.S. government science information including research and development results.” Will include articles from PubMed and data sources from the CDC among its results.
Agencies of the Department of Health & Human Services
NATIONAL LIBRARY OF MEDICINE (NLM)
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National Library of Medicine (NIH)
"The world’s largest biomedical library, NLM maintains and makes available a vast print collection and produces electronic information resources on a wide range of topics.” NLM databases include PubMed and MeSH.
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ClinicalTrials.gov
A "registry and results database of publicly and privately supported clinical studies of human participants conducted around the world." Also links to the resulting publication when applicable.
CENTERS FOR DISEASE CONTROL AND PREVENTION (CDC)
