[1] Kings Coll London, MRC, Social Genet Dev & Psychiat Ctr, London WC2R 2LS, England
[2] Univ Hong Kong, LKS Fac Med, Dept Psychiat, Pokfulam, Hong Kong, Peoples R China
[3] St James Hosp, Trinity Ctr Hlth Sci, Dept Psychiat, Dublin 8, Ireland
[4] Radboud Univ Nijmegen, Med Ctr, Dept Psychiat, NL-6525 ED Nijmegen, Netherlands
[5] Radboud Univ Nijmegen, Med Ctr, Dept Human Genet, NL-6525 ED Nijmegen, Netherlands
[6] S Herzog Mem Hosp, Jerusalem, Israel
[7] Geha Mental Hlth Ctr, ADHD Clin, Petak Tikvah, Israel
[8] Univ Clin Child & Adolescent Psychiat, Essen, Germany
[9] Univ Gottingen, Gottingen, Germany
[10] Cent Inst Mental Hlth, Dept Child & Adolescent Psychiat & Psychotherapy, D-6800 Mannheim, Germany
[11] Univ Ghent, Dept Expt Clin Hlth Psychol, B-9000 Ghent, Belgium
[12] Univ Valencia, Dept Dev Educ Psychol, Valencia, Spain
[13] Univ Hosp La Fe, Neuropediat Serv, Valencia, Spain
[14] Vrije Univ Amsterdam, Dept Clin Neuropsychol, Amsterdam, Netherlands
[15] Univ Zurich, Dept Child & Adolescent Psychiat, Zurich, Switzerland
[16] Univ Southampton, Dept Psychol, Southampton SO9 5NH, Hants, England
[17] SUNY Upstate Med Univ, Dept Psychiat, Syracuse, NY USA
[18] SUNY Upstate Med Univ, Dept Neurosci & Physiol, Syracuse, NY USA
[19] NYU, Ctr Child Study, New York, NY USA