1. Translational Research Laboratory, Catalan Insitute of Oncology (ICO), Bellvitge Biomedical Research Institute (IDIBELL)-CIBERONC, L′Hospitalet de Llobregat, Barcelona, Spain
2. Unit of Biomarkers and Susceptibility, Cancer Prevention and Control Program, ICO–IDIBELL and CIBERESP, L′Hospitalet de Llobregat, Barcelona, Spain
3. Department of Gastroenterology, University Hospital Bellvitge (HUB-IDIBELL), L′Hospitalet de Llobregat, Barcelona, Spain
4. Department of Pathology, University Hospital Bellvitge (HUB-IDIBELL), L′Hospitalet de Llobregat, Barcelona, Spain
5. Department of Gastroenterology, Germans Trias i Pujol University Hospital, Badalona, Barcelona, Spain
6. Department of Gastroenterology, Hospital of Terrassa, Terrassa Health Consortium (CST), Terrassa, Barcelona, Spain
7. Department of General and Digestive Surgery, Colorectal Unit, University Hospital Bellvitge (HUB-IDIBELL)-CIBERONC, L′Hospitalet de Llobregat, Barcelona, Spain