title: Arthritis.
mesh_terms: D000368:Aged; D001168:Arthritis / Q000145:classification / Q000453:epidemiology* / Q000209:etiology; D006801:Humans; D010003:Osteoarthritis / Q000453:epidemiology / Q000209:etiology; D012307:Risk Factors; D014481:United States / Q000453:epidemiology