[1] Vanderbilt Univ, Med Ctr, Div Pediat Cardiol, Nashville, TN USA
[2] Duke Univ, Med Ctr, Duke Clin Rsch Inst, Durham, NC USA
[3] Johns Hopkins Univ, Sch Med, Div Cardiac Surg, Baltimore, MD USA
[4] Johns Hopkins All Childrens Heart Inst, Div Cardiovasc Surg, St Petersburg, FL USA
[5] Vanderbilt Univ, Med Ctr, Div Pediat Cardiac Surg, Nashville, TN USA