Mitral valve surgery in developing countries.
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D003906:Developing Countries; D006801:Humans; D008722:Methods; D008943:Mitral Valve / Q000601:surgery*; D008944:Mitral Valve Insufficiency / Q000209:etiology / Q000601:surgery*; D008946:Mitral Valve Stenosis / Q000209:etiology / Q000601:surgery*; D012214:Rheumatic Heart Disease / Q000150:complications