作者单位:Cincinnati Childrens Hosp Med Ctr, Dept Cardiol, Cincinnati, OH 45229 USA[1]Childrens Hosp Penn, Cardiac Ctr, Div Pediat Cardiac Surg, Philadelphia, PA USA[2]Univ Michigan, Dept Pediat, Ann Arbor, MI 48109 USA[3]Boston Childrens Hosp, Dept Cardiol, 300 Longwood Ave, Boston, MA 02115 USA[4]Columbia Univ, Dept Pediat, Irving Med Ctr, Div Pediat Cardiol, New York, NY 10027 USA[5]