[1] St James Hosp, Trinity Coll Dublin, Trinity Ctr Hlth Sci, Dept Psychiat,Neuropsychiat Genet Res Grp, Dublin 8, Ireland
[2] Inst Psychiat, MRC, Social Genet Dev & Psychiat Ctr, London, England
[3] Radboud Univ Nijmegen, Med Ctr, Dept Psychiat, NL-6525 ED Nijmegen, Netherlands
[4] Radboud Univ Nijmegen, Med Ctr, Dept Human Genet, NL-6525 ED Nijmegen, Netherlands
[5] Radboud Univ Nijmegen, Med Ctr, Dept Epidemiol & Biostat, NL-6525 ED Nijmegen, Netherlands
[6] Cent Inst Mental Hlth, Dept Child & Adolescent Psychiat & Psychotherapy, D-6800 Mannheim, Germany
[7] Univ Gottingen, Gottingen, Germany
[8] Univ Southampton, Sch Psychol, Southampton, Hants, England
[9] S Herzog Mem Hosp, Jerusalem, Israel
[10] Geha Mental Hlth Ctr, ADHD Clin, Petah Tiqwa, Israel
[11] Univ Valencia, Dept Dev & Educ Psychol, Valencia, Spain
[12] Univ Clin Child & Adolescent Psychiat, Essen, Germany
[13] Univ Ghent, Dept Expt Clin Hlth Psychol, B-9000 Ghent, Belgium
[14] Vrije Univ Amsterdam, Amsterdam, Netherlands
[15] Univ Zurich, Dept Child & Adolescent Psychiat, Zurich, Switzerland
[16] SUNY Upstate Med Univ, Dept Psychiat, Syracuse, NY USA
[17] SUNY Upstate Med Univ, Dept Neurosci & Physiol, Syracuse, NY USA