1. Department of Visceral Surgery, Lindenhof Hospital Berne, Berne, Switzerland
2. Department of Abdominal and Transplant Surgery, Cliniques Universitaires St Luc, Brussels, Belgium
3. Department of General, Visceral and Transplant Surgery, University of Heidelberg, Heidelberg, Germany
4. Department of Clinical Pharmacology and Toxicology, University Hospital Basle, Basle, Switzerland