[1] St Louis Univ, Div Gastroenterol & Hepatol, Dept Internal Med, St Louis, MO 63103 USA
[2] Univ Chicago, Sect Gastroenterol Hepatol & Nutr, Ctr Pancreat Disorders, Chicago, IL 60637 USA
[3] Harvard Univ, Brigham & Womens Hosp, Sch Med, Ctr Pancreat Dis,Div Gastroenterol Hepatol & Endo, Boston, MA 02115 USA
[4] St Louis Univ, Sch Med, St Louis VAMC, Res Serv, St Louis, MO 63103 USA
[5] St Louis Univ, Sch Med, Dept Family & Community Med, St Louis, MO 63103 USA