National Guideline Clearinghouse is a database of evidence-based clinical practice guidelines and related documents.
U.S. Preventive Services Task Force's (USPSTF) conducts scientific evidence reviews of a broad range of clinical preventive health care services and develops recommendations for primary care clinicians and health systems.
Agency for Healthcare Research and Quality (AHRQ) Evidence Reports supports research that helps people make more informed decisions and improves the quality of health care services.