[1] Univ Cattolica Sacro Cuore, Univ Agostino Gemelli IRCCS, Fdn Policlin, Digest Dis Ctr, Rome, Italy
[2] Dipartimento Univ Med & Chirurg Traslazionale, Univ Cattolica Sacro Cuore, Rome, Italy
[3] Jamess Univ Hosp Leeds, Leeds Gastroenterol Inst St, Leeds, England
[4] St Jamess Univ Leeds, St Jamess Univ Hosp, Leeds Gastroenterol Inst, Leeds, England
[5] St Jamess Univ Leeds, Leeds Inst Med Res, Leeds, England