1. Institute of Anaesthesiology University of Zurich and University Hospital Zurich Switzerland
2. Department of Biostatistics, Epidemiology, Biostatistics and Prevention Institute University of Zurich Switzerland
3. Medical Directorate University of Zurich and University Hospital Zurich Switzerland
4. Department of Surgery University of Zurich and University Hospital Zurich Switzerland
5. Department of Medical Oncology and Haematology University of Zurich and University Hospital Zurich Switzerland