1. Department of Surgery, Intercantonal Hospital Broye, Payerne, Switzerland.
2. Department of Visceral Surgery, University Hospital of Lausanne (CHUV), Lausanne, Switzerland.
3. Department of Surgery, Hospital Civico, Lugano, Switzerland.
4. Department of Plastic and Reconstructive Surgery, University Hospital of Lausanne (CHUV), Lausanne, Switzerland.
5. Department of Oncology, University Hospital of Lausanne (CHUV), Lausanne, Switzerland.
6. Department of Orthopedics, University Hospital of Lausanne (CHUV), Lausanne, Switzerland.