1. Department of Psychosomatics and Psychiatry, University Children's Hospital, University of Zurich, Zurich, Switzerland
2. Division of Child and Adolescent Health Psychology, Department of Psychology, University of Zurich, Zurich, Switzerland
3. Children's Research Centre, University Children's Hospital Zurich, University of Zurich, Zurich, Switzerland
4. Department of Consultation-Liaison Psychiatry and Psychosomatic Medicine, University Hospital Zurich, University of Zurich, Zurich, Switzerland
5. Clinical Psychology and Psychological Intervention, Institute of Psychology, University Duisburg-Essen, Essen, Germany