1. Endoscopy Unit, Department of Digestive Diseases, Hospital Universitari de Bellvitge-IDIBELL, University of Barcelona, Catalonia, Spain
2. Liver Transplant Unit, Department of Surgery, Hospital Universitari de Bellvitge-IDIBELL, University of Barcelona, Catalonia, Spain
3. Faculty of Health Sciences, Universitat Oberta de Catalunya, Barcelona, Catalonia, Spain