[1] Univ Roma Tor Vergata, Med Sistemi, Cattedra Gastroenterol, Rome, Italy
[2] AO S Camillo Forlanini, GI Unit, Rome, Italy
[3] Univ Cattolica, CIC, Rome, Italy
[4] Univ Padua, Dept Gastroenterol, I-35100 Padua, Italy
[5] AO S Filippo Neri, UOC GE Hep, Rome, Italy
[6] Univ S Donato, Gastroenterol, Milan, Italy
[7] ARNAS Civ Di Cristina Benfratelli Hosp, Gastroenterol & Endoscopy Unit, Palermo, Italy
[8] Osped Maggiore Bologna, Dept Pediat, Bologna, Italy
[9] Univ Messina, GI Unit, Messina, Italy
[10] Univ Naples 2, SUN, Naples, Italy
[11] Univ Federico II, GI Unit, Rome, Italy
[12] Osped Cervello, Med Interna, Palermo, Italy
[13] S Giuseppe Hosp, Gastroenterol, Milan, Italy
[14] AOU Careggi, Dept Gastroenterol, Largo Brambilla, Florence, Italy
[15] Fatebenefratelli Hosp, Milan, Italy