[1] Oregon Hlth & Sci Univ, Portland, OR 97201 USA
[2] Cedars Sinai Med Ctr, Dept Med, Div Gastroenterol, Los Angeles, CA 90048 USA
[3] Univ Hosp Leuven, Dept Gastroenterol, Leuven, Belgium
[4] Univ N Carolina, Ctr Gastrointestinal Biol & Dis, Chapel Hill, NC USA
[5] Pfizer Inc, Collegeville, PA USA