[Features of heart sounds during extra-systole in children according to phonocardiographic data].
D002648:Child; D006331:Heart Diseases; D006347:Heart Sounds; D006801:Humans; D007223:Infant; D010701:Phonocardiography; D013599:Systole
HEART DISEASES/in infancy and childhood; PHONOCARDIOGRAPHY/in infancy and childhood