Cardiac electrogenesis in twins.
D004562:Electrocardiography; D004594:Electrophysiology; D005260:Female; D006329:Heart Conduction System / Q000502:physiology*; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D011247:Pregnancy; D011783:Quadruplets; D014310:Triplets; D014427:Twins; D014672:Vectorcardiography