1. Department of Epidemiology and Biostatistics, VU University Medical Center, Amsterdam, NL
2. Department of Pathology, VU University Medical Center, Amsterdam, NL
3. MRC Clinical Trials Unit at University College London, London, UK
4. Department of Surgery, Royal Marsden NHS Foundation Trust, London, UK
5. Department of Gastrointestinal Oncology, Royal Marsden NHS Foundation Trust, London and Surrey, UK
6. Section of Pathology and Tumour Biology, Leeds Institute of Cancer and Pathology, University of Leeds, Leeds, UK
7. Department of Pathology and GROW School for Oncology and Developmental Biology, Maastricht University Medical Center, Maastricht, NL
8. Department of Mathematics, VU University, Amsterdam, NL