1. Department of Traumatology and Orthopaedic Surgery, Kantonsspital Aarau, CH-5000 Aarau, Switzerland
2. Department of Orthopaedic Surgery, University Children’s Hospital Basel, CH-4031 Basel, Switzerland
3. Orthopädie für Kinder & Jugendliche, Praxis Zeppelin, CH-9016 St. Gallen, Switzerland
4. Faculty of Medicine, University of Basel, CH-4031 Basel, Switzerland