1. Unit of Nutrition, Environment and Cancer; Institut Català d'Oncología; Barcelona Spain
2. University of Alcalá (Department of Medicine and Medical Especialties), Department of Pathology; Hospital Universitario Príncipe de Asturias; Alcalá de Henares Spain
3. Cancer Epigenetics and Biology Program; IDIBELL; Barcelona
4. Department of Pathology; Hospital Universitario de la Princesa, IIS-IP, and Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD); Madrid
5. Department of Gastroenterology; Hospital Universitario de la Princesa, IIS-IP, and Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD); Madrid
6. Department of Gastroenterology; Hospital Universitario La Paz; Madrid
7. Department of Gastroenterology; Hospital Clínico San Carlos; Madrid Spain
8. Department of Gastroenterology; Hospital Universitario Príncipe de Asturias; Alcalá de Henares
9. Department of Gastroenterology; Hospital Universitario Río Hortega; Valladolid Spain
10. Department of Pathology; Hospital Universitario Río Hortega; Valladolid Spain
11. Department of Pathology, Hospital Clínic de Barcelona; IDIBAPS and CIBEREHD, and Universitat de Barcelona; Spain
12. Department of Gastroenterology; Hospital Clínic de Barcelona, IDIBAPS and CIBEREHD; Spain
13. Department of Pathology, and Department of Gastroenterology. Hospital Donostia/Instituto Biodonostia; Universidad del País Vasco (UPV/EHU). CIBEREHD; San Sebastián Spain
14. Department of Pathology; Hospital Clínico Universitario Lozano Blesa, Zaragoza, and CIBEREHD; Spain
15. Department of Gastroenterology; Hospital de Viladecans; Spain
16. Department of Pathology; Hospital Universitari de Bellvitge, L'Hospitalet de Llobregat; Spain
17. Departament of Medicine, Digestive Diseases Service; Institut Universitari Parc Taulí, Sabadell, and CIBEREHD; Spain