1. Department of Surgery; Academic Medical Center; Amsterdam; The Netherlands
2. Department of Gastroenterology and Hepatology; Academic Medical Center; Amsterdam; The Netherlands
3. Department of Medical Oncology; Academic Medical Center; Amsterdam; The Netherlands
4. Department of Radiation Oncology; Academic Medical Center; Amsterdam; The Netherlands
5. Department of Clinical Epidemiology; Biostatistics and Bioinformatics; Academic Medical Center; Amsterdam; The Netherlands