1. Department of Pathophysiology and TransplantationUniversità degli Studi di MilanoMilanItaly
2. Gastroenterology and Endoscopy UnitFondazione IRCCS Ca’ GrandaOspedale Maggiore PoliclinicoMilanItaly
3. Endoscopy UnitFirst Department of Internal MedicineSan Matteo Hospital FoundationUniversity of PaviaPaviaItaly
4. Epidemiology UnitFondazione IRCCS Ca’ Granda Ospedale Maggiore PoliclinicoMilanItaly