[1] Shahid Beheshti Univ Med Sci, Gastroenterol & Liver Dis Res Ctr, Tehran, Iran
[2] Vrije Univ Amsterdam, Med Ctr, Dept Gastroenterol, Amsterdam, Netherlands
[3] Spedali Civil Brescia, Dept Pathol, I-25125 Brescia, Italy
[4] Univ Bologna, St Orsola Malpighi Hosp, Dept Gastroenterol & Internal Med, Bologna, Italy
[5] Osped S Maria Misericordia, Diagnost Cytol & Histol Unit, Perugia, Italy
[6] Carol Davila Univ Med & Pharm, Dept Pathol, Bucharest, Romania
[7] Fundeni Clin Inst, Bucharest, Romania
[8] Univ Hosp G Martino, Reg Celiac Ctr, Messina, Italy
[9] Desio Hosp Desio, Dept Med, Monza, Italy
[10] Desio Hosp Desio, Dept Med, Brianza, Italy
[11] Desio Hosp Desio, Dept Pathol, Monza, Italy
[12] Desio Hosp Desio, Dept Pathol, Brianza, Italy
[13] San Giuseppe Hosp, USL Empoli Florence 11, Dept Diagnost, Unit Pathol, Florence, Italy
[14] Univ Perugia, Dept Clin & Expt Med, Gastroenterol & Hepatol Sect, I-06100 Perugia, Italy
[15] Univ Birmingham, Sch Immun & Infect, Birmingham, W Midlands, England
[16] Univ Birmingham, Coll Med & Dent Sci, Birmingham, W Midlands, England