1. Digestive System Research Unit; University Hospital Vall d'Hebron; Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD); Barcelona Spain
2. Department of Medicine; Universitat Autònoma de Barcelona; Barcelona Spain
3. Departments of Medical and Surgical Sciences and Digestive System; Centro di Ricerca Biomedica Applicata (C.R.B.A.); University of Bologna; St. Orsola-Malpighi Hospital; Bologna Italy
4. Department of Pathology; University Hospital Vall d'Hebron; Centro de Investigación Biomédica en Red de Cáncer (CIBERONC); Barcelona Spain