1. Department of Orthopaedics and Traumatology, Medical University of Innsbruck, Anichstrasse 35, 6020 Innsbruck, Austria
2. Department of Pediatrics, Garmisch-Partenkirchen Hospital, Auenstraße 6, 82467 Garmisch-Partenkirchen, Germany
3. Medical University of Innsbruck, Christoph-Probst-Platz, Innrain 52, 6020 Innsbruck, Austria
4. Department for Orthopaedic Sports Medicine, Klinikum Rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675 Munich, Germany