1. Department of Health Science Research, Mayo Clinic, Rochester, MN, USA
2. Department of Medical Oncology, Sorbonne University, Saint-Antoine Hospital, Paris, France
3. Cardiff University and Velindre Cancer Centre, Cardiff, UK
4. Department of Medical Oncology, Franco-British Institute, Levallois-Perret, France
5. Cancer Research UK and the Medical Research Council Oxford Institute for Radiation Oncology, Oxford, UK
6. Digestive Oncology, University Hospitals Gasthuisberg Leuven and University of Leuven, Belgium
7. Department of Medicine, The University of California San Francisco, San Francisco, CA, USA
8. University of Nantes Medical School Nantes, France
9. Department of Medical Oncology and Comprehensive Cancer Center, University of Munich, Munich, Germany
10. Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, the Netherlands
11. Department of Oncology, University of Pisa, Italy
12. Department of Oncology, Haematology and Bone Marrow Transplantation with Section of Pneumology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
13. Medical Research Council Clinical Trials Unit, University College London, London, UK
14. Department of Gastrointestinal Oncology, Keck School of Medicine at USC, Los Angeles, CA, USA
15. Department of Medical Oncology, University Medical Center Utrecht, University of Utrecht, Utrecht, the Netherlands
16. Department of Gastrointestinal Oncology, National Cancer Center Hospital East, Chiba, Japan
17. Monash University, Melbourne, Australia
18. West Cancer Center, Germantown, TN, USA