1. Gastroenterology Department Complexo Hospitalario Universitario de Ourense Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd) Ourense Spain
2. Instituto de Investigacién Biomédica Galicia Sur Ourense Spain
3. Department of Biochemistry, Genetics and Immunology Faculty of Biology University of Vigo Vigo Spain
4. Clinical Analysis Department Complexo Hospitalario Universitario de Ourense Centro de Investigacién Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd) Ourense Spain
5. Gastroenterology Department Donostia Hospital Biodonostia Institute CIBERehd University of the Basque Country UPV/EHU San Sebastián Spain
6. Admission and Clinical Documentation Department Donostia Hospital San Sebastián Spain
7. Osakidetza OSI Donostialdea Altza Primary Care; Biodonostia Health Research Institute San Sebastián Spain
8. Colorectal Cancer Screening Programme Osakidetza Basque Health Service Bilbao Spain