[1] RCCS Policlin San Donato, Gastroenterol & Digest Endoscopy Unit, Milan, Italy
[2] Allgemeines Krankenhaus Celle, Klin Gastroenterol GI Onkol, Celle, Germany
[3] IRCCS Policlin San Donato, Gastroenterol & Digest Endoscopy Unit, Milan, Italy
[4] AO Lodi, Gastroenterol & Digest Endoscopy Unit, Lodi, Italy
[5] Royal Hallamshire Hosp, Dept Gastroenterol, Sheffield, S Yorkshire, England
[6] Royal Infirm Edinburgh NHS Trust, Ctr Liver & Digest Disorders, Edinburgh, Midlothian, Scotland
[7] Osped Valcuce, Gastroenterol Dept, Como, Italy
[8] IRCCS Policlin San Donato, Milan, Italy