[1] Univ Med & Pharm Craiova, Res Ctr Gastroenterol & Hepatol, Craiova, Romania
[2] Ankara Univ, Fac Med, Dept Gastroenterol, TR-06100 Ankara, Turkey
[3] UT MD Anderson Canc Ctr, Dept Gastroenterol Hepatol & Nutr, Houston, TX 77030 USA
[4] Univ Sao Paulo, Dept Gastroenterol, BR-09500900 Sao Paulo, Brazil