1. Centre for Sports Orthopedics and Special Joint Surgery, Orthopedic Hospital Markgroeningen, Markgroeningen, Germany
2. Department of Orthopedics and Traumatology, Paracelsus Private Medical University, Clinic Nuremberg, Nuremberg, Germany
3. Department of Orthopaedics and Traumatology, Medical University of Innsbruck, Innsbruck, Austria