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