1. GI-Unit, 3rd Department of Internal Medicine National and Kapodistrian University of Athens, Sotiria Hospital, Athens, Greece
2. Gastroenterology Department, Alexandra General Hospital, Athens, Greece
3. Gastroenterology Department, Hospital Universitari Germans Trias I Pujol, Badalona, Catalonia, Spain, and Centro de Investigación Biomédica En Red de Enfermedades Hepáticas Y Digestivas (CIBEREHD), Madrid, Spain