[1] Univ Pavia, Fdn IRCCS Policlin San Matteo, Dept Internal Med 1, Coeliac Ctr, I-27100 Pavia, Italy
[2] Univ Paris 05, Hop Europeen Georges Pompidou, Dept Gastroenterol, Paris, France
[3] Vrije Univ Amsterdam, Med Ctr, Dept Gastroenterol & Hepatol, Amsterdam, Netherlands
[4] St Orsola Malpighi Univ Hosp, Dept Clin Med, Coeliac Ctr, Bologna, Italy
[5] Univ Salerno, Gastrointestinal Unit, Dept Med & Surg, I-84100 Salerno, Italy
[6] Univ Padua, Dept Surg & Gastroenterol Sci, Padua, Italy
[7] Univ Turin, AOU San Giovanni Battista Molinette, Dept Gastrohepatol, Turin, Italy
[8] Fdn IRCCS Policlin San Matteo, Pavia, Italy