The American Medical Association (AMA) http://www.ama-assn.org
The American Public Health Association (APHA) http://www.apha.org
The National Association of County and City Health Officials (NACCHO) http://www.naccho.org
Association of State and Territorial Health Officials (ASTHO) http://www.astho.org
Centers for Disease Control and Prevention (CDC) http://www.cdc.gov
National Institutes of Health (NIH) http://www.nih.gov