1. Endoscopy Unit, Department of Digestive Diseases, Hospital Universitari de Bellvitge, IDIBELL, Barcelona, Spain
2. Department of Surgery, Hospital Universitari de Bellvitge, IDIBELL (Bellvitge Biomedical Research Institute), Barcelona, Spain
3. Pathology Department, Hospital Universitari de Bellvitge, IDIBELL, Barcelona, Spain
4. Department of Medical Oncology, Institut Català d’Oncologia DiR, IDIBELL, Barcelona, Spain