1. Division of Transplantation, Department of Surgery; Leiden University Medical Center; Leiden the Netherlands
2. Department of Medical Statistics; Leiden University Medical Center; Leiden the Netherlands
3. Department of Surgery; Ghent University Hospital Medical School; Ghent Belgium
4. Department of Gastroenterology and Hepatology; Leiden University Medical Center; Leiden the Netherlands
5. Eurotransplant International Foundation; Leiden the Netherlands