[1] Univ Duisburg Essen, Univ Hosp Essen, Dept Child & Adolescent Psychiat, Essen, Germany
[2] Univ Hosp Zurich, Dept Consultat Liaison Psychiat & Psychosomat Med, Zurich, Switzerland
[3] Univ Hosp Ulm, Dept Pediat & Adolescent Med, Div Pediat Endocrinol & Diabet, Ulm, Germany
[4] Univ Duisburg Essen, Univ Hosp Essen, Dept Child & Adolescent Psychiat, Wickenburgstr 21, D-45147 Essen, Germany