[1] Univ Guadalajara, Dept Med, Guadalajara 44430, Jalisco, Mexico
[2] Mayo Clin, Dept Med, Miles & Shirley Fiterman Ctr Digest Dis, Rochester, MN USA
[3] Mayo Clin, Dept Radiol, Rochester, MN USA
[4] Indiana Univ, Dept Med, Div Gastroenterol Hepatol, Clarian IU Digest Dis Ctr,Sch Med, Indianapolis, IN USA