title: Letter: Severe mitral valve disease in children.
mesh_terms: D000293:Adolescent; D002648:Child; D006350:Heart Valve Prosthesis; D006801:Humans; D008943:Mitral Valve / Q000473:pathology / Q000601:surgery*; D008946:Mitral Valve Stenosis / Q000473:pathology / Q000601:surgery*