http://www.dmoz.org/Health/
http://www.dmoz.org/Health/Senior_Health/
http://www.dmoz.org/Health/Aging/
http://www.nlm.nih.gov/medlineplus/
Medical Dictionary: http://www.nlm.nih.gov/medlineplus/mplusdictionary.html
Medical Encylopedia: http://www.nlm.nih.gov/medlineplus/encyclopedia.html
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