1. Endoscopy Unit, Department of Digestive Diseases, Hospital Universitari de Bellvitge, Bellvitge Biomedical Research Institute (IDIBELL), University of Barcelona, Spain
2. Medical Oncology Department, Institut Català d’Oncologia DiR, Bellvitge Biomedical Research Institute (IDIBELL), L’Hospitalet, Barcelona, Spain
3. Faculty of Health Sciences, Universitat Oberta de Catalunya, Barcelona, Spain