[1] Ohio State Univ Wexner, Div Gastroenterol Hepatol & Nutr, Med Ctr, Columbus, OH 43210 USA
[2] Ohio State Univ Wexner, Div Endocrinol Diabet & Metab, Med Ctr, Columbus, OH USA
[3] Univ Minnesota, Sch Med, Dept Pediat, Minneapolis, MN USA
[4] Univ Minnesota, Sch Med, Dept Surg, Minneapolis, MN USA
[5] Univ Pittsburgh, Med Ctr, Div Gastroenterol, Pittsburgh, PA USA
[6] NIDDK, Div Digest Dis & Nutr, NIH, Bethesda, MD USA