1. Division of Sports and Rehabilitation Medicine, Ulm University Medical Centre, 89075 Ulm, Germany
2. Institute of Epidemiology and Preventive Medicine, University of Regensburg, 93053 Regensburg, Germany
3. Institute of Epidemiology and Medical Biometrics, Ulm University, 89075 Ulm, Germany
4. Division of Pediatric Endocrinology and Diabetology, Ulm University Medical Centre, 89075 Ulm, Germany