title: The atrioventricular conduction time - a heritable trait? III. Twin studies.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D004562:Electrocardiography; D005260:Female; D005823:Genetics; D006329:Heart Conduction System; D006801:Humans; D008297:Male; D008875:Middle Aged; D011247:Pregnancy; D014427:Twins