title: Racial variations in the childhood electrocardiogram: preliminary observations.
mesh_terms: D001741:Black or African American; D000367:Age Factors; D006332:Cardiomegaly / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D004562:Electrocardiography; D006321:Heart / Q000502:physiology*; D006801:Humans; D008297:Male; D044469:Racial Groups; D044465:White People