American Board of Clinical Neuropsychology
http://www.theabcn.org

American Board of Medical Specialties
http://www.abms.org

American Medical Association Physician Finder
http://www.ama-assn.org/aps/amahg.htm

American Society of Clinical Oncology
http://www.cancer.net/patient/Diagnosis+and+Treatment/Finding+Quality+Care/Find+an+Oncologist/Find+an+Oncologist+Database

Neurosurgeon Finder
http://www.neurosurgerytoday.org/findaneuro

National Library of Medicine - National Institutes of Health: Find a Doctor
http://www.nlm.nih.gov/medlineplus/directories.html

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