[1] Univ Milan, Policlin IRCCS San Donato, I-20097 San Donato Milanese, Italy
[2] Univ Roma La Sapienza, Unita Gastroenterol, Rome, Italy
[3] Osped Valduce, Unita Gastroenterol, Como, Italy
[4] Azienda Osped Fatebenefratelli & Oftalm, Unita Med Interna & Epatol, Milan, Italy
[5] Osped St Orsola, Fdn Poliambulanza, Unita Gastroeneterol, Brescia, Italy
[6] Osped Riuniti Bergamo, Unita Strutturale Complessa Gastroenterol, Bergamo, Italy
[7] Osped San Pio Pietrelcina, Unita Gastroenterol, Vasto, Italy
[8] Univ Padua, I-35100 Padua, Italy
[9] Univ Florence, I-50121 Florence, Italy
[10] Azienda Osped San Filippo Neri, Unita Gastroenterol & Epatol, Rome, Italy
[11] Arcispedale St Anna, Unita Gastroenterol & Endoscopia Digest, Ferrara, Italy
[12] Osped Bolzano, Div Gastroenterol, Bolzano, Italy
[13] Osped Santa Maria delle Croci, Unita Operat Gastroenterol & Nutr Clin, Ravenna, Italy