[1] Univ Clin RWTH Aachen, Dept Child & Adolescent Psychiat Psychosomat & Ps, Neuenhofer Weg 21, D-52074 Aachen, Germany
[2] Christian Albrecht Univ Kiel, Inst Med Biometry & Stat, Kiel, Germany
[3] Univ Hosp Wuerzburg, Dept Child & Adolescent Psychiat Psychosomat & Ps, Wurzburg, Germany
[4] Charite, Dept Child & Adolescent Psychiat Psychosomat & Ps, Berlin, Germany
[5] Univ Clin RWTH Aachen, Child Neuropsychol Sect, Dept Child & Adolescent Psychiat Psychosomat & Ps, Psychosomat & Psychotherapy, Aachen, Germany