[The electrocardiogram in first graders].
D000367:Age Factors; D001604:Berlin; D002648:Child; D004562:Electrocardiography; D005080:Exercise Test; D005260:Female; D006321:Heart / Q000502:physiology; D006801:Humans; D008297:Male; D012572:School Health Services
Die Herzstromkurve bei Schulanfängern.