[1] Hacettepe Univ, Fac Med, Dept Gastroenterol, TR-06100 Ankara, Turkey
[2] Numune Res & Educ Hosp, Dept Gastroenterol, Ankara, Turkey
[3] Hacettepe Univ, Fac Med, Dept Pathol, TR-06100 Ankara, Turkey
[4] CHU Reims, Dept Hepatogastroenterol, Reims, France
[5] Univ Bologna, Dept Clin Med, Bologna, Italy