1. Department of Osteology and Biomechanics, University Medical Center Hamburg–Eppendorf, Hamburg, Germany
2. Institute of Medical Statistics and Epidemiology, Technical University, Munich, Germany
3. Pediatric Sports Medicine, Altona Children’s Hospital, Orthopaedic Department, University Medical Center Hamburg–Eppendorf, Hamburg, Germany
4. Department of Diagnostic Radiology and Neuroradiology, Central Clinics Augsburg, Germany