1. Clinical Effectiveness Research Group, Department of Transplantation Medicine, Oslo University Hospital, and Clinical Effectiveness Research Group, University of Oslo, Oslo, Norway (F.E.J., K.K.G., M.K., M.B., M.L.)
2. Cancer Screening and Prevention Research Group, Department of Surgery and Cancer, Imperial College London, London, United Kingdom (A.J.C., K.W.)
3. Division of Gastroenterology, Hepatology and Nutrition, Department of Epidemiology, University of Pittsburgh, Pittsburgh, Pennsylvania (R.E.S.)
4. University Hospital Città della Salute e della Scienza, Turin, Italy (C.S., N.S., P.A.)
5. National Cancer Institute, Division of Cancer Prevention, Rockville, Maryland (P.P., E.M.)
6. Clinical Effectiveness Research Group, Department of Transplantation Medicine, Oslo University Hospital, and Clinical Effectiveness Research Group, University of Oslo, Oslo, Norway, and Department of Gastroenterology, Hepatology and Clinical Oncology, Centre of Postgraduate Medical Education, Warsaw, Poland (P.W.)
7. Clinical Effectiveness Research Group, Department of Transplantation Medicine, Oslo University Hospital, and Clinical Effectiveness Research Group, University of Oslo, Oslo, Norway, and Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden (H.O.A.)
8. Section for Colorectal Cancer Screening, Cancer Registry of Norway, Oslo, Department of Research and Development, Telemark Hospital Trust, Skien, and Institute of Clinical Medicine, University of Oslo, Oslo, Norway (G.H.)
9. Clinical Effectiveness Research Group, Department of Transplantation Medicine, Oslo University Hospital, and Clinical Effectiveness Research Group, University of Oslo, Oslo, Norway, and Department of Medicine, Sørlandet Hospital Health Trust, Kristiansand, Norway (Ø.H.).