1. The Netherlands Cancer Institute, Antoni van Leeuwenhoek Hospital, Amsterdam, Netherlands
2. Academic Medical Center, University of Amsterdam, Amsterdam, Netherlands
3. Leeuwarden Medical Center, Leeuwarden, Netherlands
4. University Medical Centre Utrecht, Utrecht, Netherlands
5. University College London Cancer Institute, London, United Kingdom
6. University Hospital Aintree, Liverpool, United Kingdom
7. Department of General and Visceral Surgery, University Hospital Frankfurt, Frankfurt Am Main, Germany
8. EORTC Headquarters, Brussels, Belgium
9. EORTC Headquarters , Brussels, Belgium
10. Digestive Oncology, University Hospital Gasthuisberg, Leuven, Belgium
11. Caritasklinikum St. Theresia, Saarbrücken, Germany
12. Centre Hospitalier Universitaire Ambroise Paré, Assistance Publique Hôpitaux de Paris, Boulogne-Billancourt, France