1. Department of Dermatology and Allergology, Ludwig-Maximilians-University, Munich, Germany;;
2. Department of Trauma Surgery and Orthopaedics, Klinikum Memmingen, Germany (Academic Teaching Hospital of Ludwig-Maximilians-University Munich);;
3. Clinic of Trauma Surgery and Orthopaedics, Bünde, Germany;;
4. Clinic for Orthopaedic Surgery, Brig, Switzerland;;
5. Clinic of Trauma Surgery and Orthopaedics, St Gallen, Switzerland