Yokota, M [P loop of Frank method in secondary ostium atrial septal defect]. [electronic resource] - Nihon rinsho. Japanese journal of clinical medicine Jul 1978 - 2848-53 p. digital Publication Type: Journal Article ISSN: 0047-1852 Subjects--Topical Terms: AdolescentAdultFemaleHeart Septal Defects, Atrial--physiopathologyHumansMaleMiddle AgedVectorcardiography