[1] Univ Penn, Childrens Hosp Philadelphia, Sch Med, Div Human Genet, Philadelphia, PA 19104 USA
[2] Ctr Addict & Mental Hlth, Clin Genet Res Program, Toronto, ON, Canada
[3] Toronto Gen Hosp, Univ Hlth Network, Peter Munk Cardiac Ctr, Toronto Congenital Cardiac Ctr Adults, Toronto, ON, Canada
[4] Univ Toronto, Dept Psychiat, Toronto, ON, Canada
[5] Univ Penn, Childrens Hosp Philadelphia, Sch Med, Div Allergy & Immunol, Philadelphia, PA 19104 USA
[6] Cincinnati Childrens Hosp, Cincinnati, OH USA
[7] Med Ctr, Cincinnati, OH USA
[8] Great Ormond St Hosp Sick Children, London, England
[9] Bambino Gesu Pediat Hosp, Dept Med Genet, Rome, Italy
[10] Univ Leuven, Louvain, Belgium
[11] Univ Roma La Sapienza, Rome, Italy
[12] Queen Silvia Childrens Hosp, Gothenburg, Sweden
[13] Hosp Timone, Marseille, France
[14] Univ Med Ctr Utrecht, Utrecht, Netherlands