1. Unidad de Gastroenterología. Hospital General Universitario de Alicante, Alicante, Spain
2. Department of Health Management and Health Economics, University of Oslo, Oslo, Norway
3. Gastroenterology and Hepatology, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands
4. Department of Epidemiology and Biostatistics, Sloan Kettering Memorial Cancer Center, New York, New York, United States
5. Epidemiology and Biostatistics, Harvard T.H. Chan School of Public Health, and Harvard-MIT Division of Health Sciences and Technology, Boston, Massachusetts, United States
6. Department of Public Health, Erasmus MC, Rotterdam, the Netherlands
7. Frontier Science (Scotland) Ltd., Kingussie, United Kingdom
8. Gastroenterology, University Barcelona, CIBERehd, IDIBAPS, Barcelona, Spain
9. Department of Gastroenterological Oncology, the Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, and Medical Center for Postgraduate Education, Warsaw, Poland
10. Gastroenterology, Hospital Universitario de Canarias, La Laguna, Spain
11. AOU Città della Salute e della Scienza – CPO Piemonte, Turin , Italy
12. Instituto Português de Oncologia do Porto, and CINTESIS/Faculty of Medicine, University of Porto, Porto, Portugal
13. Gastroenterology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States