[1] Univ Cincinnati, Dept Med, Div Digest Dis, Cincinnati, OH 45221 USA
[2] Univ Cincinnati, Div Gen Internal Med, Cincinnati, OH USA
[3] Univ Cincinnati, Ctr Clin Effectiveness, Cincinnati, OH USA
[4] Henry Ford Hosp, Div Gastroenterol & Hepatol, Detroit, MI 48202 USA
[5] Weill Cornell Med Coll, New York, NY USA
[6] Univ Miami Hosp & Clin, Miami, FL USA