title: [Clinical course of chronic rheumatic heart disease in children with mitral valve insufficiency].
mesh_terms: D000293:Adolescent; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D002908:Chronic Disease; D005260:Female; D006801:Humans; D008297:Male; D008944:Mitral Valve Insufficiency / Q000150:complications*; D012214:Rheumatic Heart Disease / Q000150:complications*
vernacular_title: Kliniczny przebieg przewlekłej reumatycznej choroby serca u dzieci z niedomykalnościa zastawki dwudzielnej