[1] Yale Sch Med, Yale Child Study Ctr, New Haven, CT USA
[2] Childrens Hosp Westmead, TY Nelson Dept Neurol & Neurosurg, Sydney, NSW 2145, Australia
[3] Univ Sydney, Childrens Hosp Westmead Clin Sch, Fac Med & Hlth, Sydney Med Sch, Westmead, NSW 2145, Australia
[4] Univ Alabama Birmingham, Dept Pediat, Birmingham, AL USA
[5] Univ Alabama Birmingham, Dept Neurol, UAB Stn, Birmingham, AL 35294 USA
[6] Childrens Hosp Westmead, Dept Psychol Med, Sydney, NSW 2145, Australia
[7] Sydney Med Sch, Westmead Inst Med Res, Discipline Psychiat & Child & Adolescent Hlth, Westmead, NSW 2145, Australia
[8] Univ Alabama Birmingham, Dept Psychiat, Birmingham, AL USA