American Board of Medical Specialists - provides certification information for doctors nationwide free of charge

The American Cancer Society

American Medical Association

Brain Injury Association - Brain injury prevention, research and advocacy

CS ChemFinder

Health Hippo

Health on the Net Foundation

InteliHealth

Mayo Clinic

Medline

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Medical World Search

National Institutes of Health

National Crime Prevention Council

National Criminal Justice Reference Center

OBGYN

RxList

US Department of Justice / Office for Victims of Crime