1. Faculty of Health, School of Medicine, Witten/Herdecke
University, Witten, Germany
2. Department for Child and Adolescent Psychiatry and Psychotherapy,
University Medical Centre of the Johannes Gutenberg University Mainz, Mainz,
Germany
3. Medical Biometrics, Epidemiology and Health Informatics, Saarland
University, Homburg, Germany
4. Clinic for Paediatrics and Adolescent Medicine, University of
Tübingen, Tübingen, Germany