- American Medical Associationwww.ama-assn.org
- National Institutes of Healthwww.health.nih.gov
- MedicineNet – Health and Medical Information Produced by Doctorswww.medicinenet.com
- U. S. Department of Health & Human Serviceswww.hhs.gov
- American Public Health Associationwww.apha.org
