1. Department of Psychiatry, Psychosomatics and Psychotherapy, University Hospital of Tübingen, Tübingen, Germany;
2. Centre of Mental Health, Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, University Hospital of Würzburg, Würzburg, Germany;
3. Practise for Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, Aschaffenburg, Germany;
4. Institute of Clinical Epidemiology and Biometry, University of Würzburg, Würzburg, Germany;
5. Institute of Social Medicine, Epidemiology and Health Economics, Charité - Universitätsmedizin Berlin, Berlin, Germany