[Polycardiographic studies in preschool children].
D002675:Child, Preschool; D004562:Electrocardiography; D006330:Heart Defects, Congenital / Q000175:diagnosis*; D006801:Humans; D008403:Mass Screening; D010701:Phonocardiography; D012541:Scarlet Fever / Q000175:diagnosis*; D014069:Tonsillitis / Q000175:diagnosis*
Polikardiohrafichni doslidzhennia u diteĭ doshkil'noho viku.