title: [Ectopic heart beats in children and adolescents in the light of personal observations].
mesh_terms: D000293:Adolescent; D000367:Age Factors; D005117:Cardiac Complexes, Premature / Q000209:etiology*; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007239:Infections / Q000150:complications*; D012213:Rheumatic Fever / Q000150:complications
vernacular_title: Skurcze dodatkowe serca u dzieci i młodziezy w świetle własnych obserwacji