1. Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland
2. Department of Dermatology, University Hospital of Zurich, Zurich, Switzerland
3. Department of Musculoskeletal System, University Hospital of Lausanne, Epalinges, Switzerland
4. Cardio-Vascular Surgery, University Hospital Zurich, Zurich, Switzerland
5. University Hospital of Lausanne, Lausanne, Switzerland
6. University Hospital Zurich, Zurich, Switzerland
7. Division of Cardiac Surgery, University Hospital of Basel, Basel, Switzerland