[1] Childrens Healthcare Atlanta, Dept Neuropsychol, 1400 Tullie Rd, Atlanta, GA 30329 USA
[2] Emory Univ, Dept Rehabil Med, Atlanta, GA USA
[3] Childrens Natl Hlth Syst, Div Neuropsychol, Washington, DC USA
[4] George Washington Univ, Sch Med, Dept Psychiat, Washington, DC USA
[5] George Washington Univ, Sch Med, Dept Behav Sci, Washington, DC USA
[6] George Washington Univ, Sch Med, Dept Paediat, Washington, DC USA
[7] Boston Childrens Hosp, Dept Psychiat, Boston, MA USA
[8] Harvard Med Sch, Boston, MA 02115 USA
[9] Boston Childrens Hosp, Dept Neurol, Boston, MA USA
[10] Boston Childrens Hosp, Dept Cardiol, Boston, MA USA
[11] Hosp Sick Children, Labatt Family Heart Ctr, Toronto, ON, Canada
[12] Univ Toronto, Dept Paediat, Toronto, ON, Canada
[13] Cincinnati Childrens Hosp Med Ctr, Heart Inst, Cincinnati, OH 45229 USA