1. Vestische Kinder- und Jugendklinik Datteln, University of Witten-Herdecke, Datteln, Germany
2. Department of Child and Adolescent Medicine, Klinikum Links der Weser, Bremen, Germany
3. Kinderkrankenhaus Sankt Marien, Landshut, Germany
4. Division of Child and Adolescent Medicine, Deutsche Klinik für Diagnostik, Wiesbaden, Germany
5. Department of Child and Adolescent Medicine, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
6. Praxis für Kinder und Jugendliche, Kassel, Germany
7. Department of Pediatrics and Adolescent Medicine, University Medical Center Ulm, Ulm, Germany
8. Christliches Kinderhospital, Osnabrück, Germany
9. Institute of Medical Biometry and Epidemiology, University of Witten-Herdecke, Witten, Germany
10. Department of Newborn, Child and Adolescent Medicine, Klinikum Nürnberg, Nürnberg, Germany