1 Department of Gastroenterology, University of Liverpool, Royal Liverpool University Hospital, Liverpool, UK.
2 Department of Gastroenterology and Hepatology, National Liver Institute, Menoufia University, Shebine Elkom, Egypt.
3 Department of Surgery, Dentistry, Paediatrics and Gynaecology, Unit of General and Pancreatic Surgery, The Pancreas Institute Verona, University of Verona, Verona, Italy.
4 General Surgery Unit, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, Verona, Italy.
5 Division Gastroenterology-Hepatology, Maastricht University Medical Center+, Maastricht, The Netherlands.