[1] Washington Univ, Barnes Jewish Hosp, Dept Med, St Louis, MO USA
[2] Washington Univ, Barnes Jewish Hosp, Div Gen Surg, Sect Colon & Rectal Surg, St Louis, MO USA
[3] Washington Univ, Barnes Jewish Hosp, Dept Pathol & Immunol, St Louis, MO USA
[4] Washington Univ, Barnes Jewish Hosp, Dept Med, Div Gastroenterol & Hepatol, St Louis, MO 63130 USA