Mitral valve disease over the age of 50.
D000368:Aged; D002908:Chronic Disease; D004194:Disease; D006331:Heart Diseases; D006349:Heart Valve Diseases; D006801:Humans; D008943:Mitral Valve; D009205:Myocarditis; D012214:Rheumatic Heart Disease
AGED/diseases; MITRAL VALVE/diseases