1. First Medical DepartmentInterdisciplinary EndoscopyUniversity Medical Center MainzMainzGermany
2. Internistische Schwerpunktpraxis Bad SalzuflenGermany
3. Institute of PathologyKlinikum BayreuthGermany
4. Department of GastroenterologyUniversity Hospital GasthuisbergLeuvenBelgium
5. Gastroenterology and Endoscopy UnitFondazione IRCCS Ca'Granda Ospedale Maggiore PoliclinicoMilanItaly