1. Musculoskeletal Centre, Orthopaedics Lower Extremities, Schulthess Clinic, Zurich, Switzerland
2. Department of Health Sciences and Technology, Cartilage Engineering and Regeneration Laboratory, ETH Zurich, Switzerland
3. Department for Orthopedic Surgery and Traumatology, Freiburg University Hospital, Freiburg, Germany
4. FIFA Medical Assessment and Research Centre (F-MARC), FIFA, Zurich, Switzerland