American Academy of Family Physicians
American Medical Association
Centers for Disease Control and Prevention
My Optum Health
HealthAnswers.com
healthfinder
Health on the Net
Cardinal Health
WebMD
Intelihealth
Mayo Health Oasis
MedExplorer
Medical Matrix
Medscape
Meducation
The Mining Company
National Health Information Center
North Memorial Health Care's Medical Library
National Organization for Rare Disorders, Inc. (NORD)
Office of Rare Diseases (ORD)
onhealth
Wellness Web
