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Medical Diseases & Conditions - Mayo Clinic
Disease - Wikipedia
Disease | Definition, Types, & Control | Britannica
Disease Definition & Meaning - Merriam-Webster
Infectious diseases - Symptoms & causes - Mayo Clinic
Human disease | Definition & Facts | Britannica
Infectious disease | Definition, Types, & Causes | Britannica
Centers for Disease Control and Prevention
Parkinson's disease - Symptoms and causes - Mayo Clinic
Infectious Disease: Types, Causes & Treatments - Cleveland Clinic