[1] Res Ctr Julich, Dept Med, Inst Neurosci & Biophys, D-52425 Julich, Germany
[2] Res Ctr Julich, Brain Imaging Ctr W, D-52425 Julich, Germany
[3] Univ Hosp Aachen, Dept Child & Adolescent Psychiat, D-52074 Aachen, Germany
[4] UCL, Inst Neurol, Wellcome Trust Ctr Neuroimaging, London WC1N 3BG, England
[5] Univ Oxford, Dept Clin Neurol, Neuropsychol Unit, Oxford OX2 6HE, England
[6] Univ Marburg, Dept Child & Adolescent Psychiat, D-35032 Marburg, Germany
[7] Univ Cologne, Dept Neurol, D-50931 Cologne, Germany