[1] Maltepe Univ, Med Fac Internal Med, Clin Gastroenterol, TR-34843 Maltepe, Turkey
[2] Houston Methodist Hosp, Lynda K & David M Underwood Ctr Digest Disorders, Gastroenterol & Hepatol, Houston, TX 77062 USA
[3] Weill Cornell Med Coll, Houston, TX 77062 USA