[1] Fdn Poliambulanza, Digest Endoscopy Unit, Brescia, Italy
[2] Nuovo Regina Margherita Hosp, Dept Gastroenterol, Rome, Italy
[3] Med Univ Graz, Div Gastroenterol & Hepatol, Dept Internal Med, Graz, Austria
[4] KH Rudolfstiftung, Internal Med 4, Vienna, Austria
[5] Paracelsus Med Univ, Oberndorf Hosp, Teaching Hosp, Dept Internal Med, Salzburg, Austria
[6] Med Univ Vienna, Dept Gastroenterol & Hepatol, Vienna, Austria
[7] Krankenhaus Barmherzigen Schwestern Ried, Interne Abt, Ried, Austria
[8] KH Elisabethinen, Internal Med 4, Linz, Austria