[1] Univ Hlth Network, Peter Munk Cardiac Ctr, Toronto, ON, Canada
[2] Childrens Alabama, Dept Pediat, Div Cardiol, Birmingham, AL USA
[3] Childrens Natl Hlth Syst, Div Pediat Cardiol, Washington, DC USA
[4] Emory Univ, Sch Med, Div Cardiol, Dept Med, Atlanta, GA 30322 USA
[5] Emory Univ, Sch Med, Dept Med, Div Gastroenterol, Atlanta, GA 30322 USA
[6] Cincinnati Childrens Hosp Med Ctr, Inst Heart, Dept Cardiol, Cincinnati, OH 45229 USA
[7] Childrens Hosp Philadelphia, Dept Pediat, Div Cardiol, Philadelphia, PA 19104 USA
[8] Boston Childrens Hosp, Boston, MA USA
[9] Brigham & Womens Hosp, 75 Francis St, Boston, MA 02115 USA
[10] Univ Mississippi, Med Ctr, Div Pediat Cardiothorac Surg, Jackson, MS 39216 USA
[11] Oregon Hlth & Sci Univ, Knight Cardiovasc Inst, Portland, OR 97201 USA
[12] Emory Univ, Sch Med, Sibley Heart Ctr Cardiol, Atlanta, GA 30322 USA