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Medline Plus 

Health information from the National Library of Medicine. Provides easy access to conditions, definitions, therapies, doctor finders, and drug information in language intended for consumers.

Mayo Clinic

Doctors and researchers from the Mayo Clinic share information on conditions and therapies to help you improve your health.

Merck Manual Home Health Handbook

Comprehensive and understandable explanations of conditions and therapies from the renowned medical text publisher.