[1] Virginia Commonwealth Univ, Sch Med, Div Gastroenterol Hepatol & Nutr, Dept Internal Med, Richmond, VA USA
[2] Pontificia Univ Catolica Chile, Escuela Med, Dept Gastroenterol, Santiago, Chile
[3] Univ Kansas, Med Ctr, Dept Med, Div Gastroenterol & Hepatol, Kansas City, KS USA
[4] Mt Sinai Sch Med, Dept Med, Div Gastroenterol & Hepatol, New York, NY USA
[5] Univ Louisville, Dept Med, Div Gastroenterol & Hepatol, Louisville, KY USA
[6] VA Med Ctr, Hlth Res, Sioux Falls, SD USA