[1] Harvard Med Sch, Dept Pediat, Boston, MA 02115 USA
[2] Boston Childrens Hosp, Dept Cardiol, 300 Longwood Ave, Boston, MA 02115 USA
[3] Univ New South Wales UNSW Sydney, Sch Womens & Childrens Hlth, UNSW Med, Discipline Paediat, Sydney, NSW, Australia
[4] Sydney Childrens Hosp Network, Heart Ctr Children, Cardiac Serv, Sydney, NSW, Australia
[5] Alfred I DuPont Hosp Children, Nemours Cardiac Ctr, Wilmington, DE USA
[6] Thomas Jefferson Univ, Sidney Kimmel Med Coll, Dept Pediat, Philadelphia, PA 19107 USA
[7] Great Ormond St Hosp Children NHS Fdn Trust, Heart & Lung Directorate, London, England
[8] UCL, Inst Cardiovasc Sci, London, England
[9] Great Ormond St Hosp Sick Children, Natl Inst Hlth Res, Biomed Res Ctr, London, England
[10] Columbia Univ, Dept Psychiat, New York, NY USA
[11] Columbia Univ, Irving Inst Clin & Translat Res, New York, NY USA
[12] New York State Psychiat Inst & Hosp, New York, NY 10032 USA