KidsHealth

http://www.kidshealth.org/

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-- well-trusted source for physician-reviewed information and advice on children's health and parenting issues

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Centers for Disease Control and Prevention

http://www.cdc.gov/

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-- provides current information on immunizations, diseases & conditions, traveler's health, and emergency preparedness

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Mayo Clinic

http://www.mayoclinic.org/

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-- provides comprehensive guides on various medical conditions

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