Electrocardiographic findings in healthy premature infants.
D002648:Child; D004562:Electrocardiography; D006801:Humans; D007223:Infant; D007229:Infant Welfare; D007231:Infant, Newborn; D007234:Infant, Premature / Q000502:physiology*
ELECTROCARDIOGRAPHY/in infancy and childhood; INFANT, PREMATURE/physiology