[1] Rocky Vista Univ, Sch Med, Ivins, UT USA
[2] Univ Utah Hlth, Gastroenterol & Hepatol, Salt Lake City, UT USA
[3] Brooklyn Hosp Ctr, Gastroenterol & Hepatol, Brooklyn, NY USA
[4] Univ Hosp Verona, Pancreas Inst, Gastroenterol & Digest Endoscopy Unit, Verona, Italy
[5] Univ Foggia, Dept Med Sci, Sect Gastroenterol, I-71122 Foggia, Italy