Entrez-PubMed PubMed is the National Library of Medicine's search service that provides access to over 11 million citations in MEDLINE, PreMEDLINE, and other related databases, with links to participating online journals.

JAMA The Journal of the American Medical Association

Institute of Medicine Reports and studies on medical issues, including reports on
medical errors.

National Association of Health Data Organizations A non-profit group with information and links about doctors and hospitals.

HealthGrades A private firm that grades and profiles hospitals, nursing homes and providers. Offers related health care information.

Medscape Clinical information, peer-reviewed articles for health professionals, drug research and news from the field of health care.