[1] Massachusetts Gen Hosp, Div Gastroenterol, Boston, MA 02114 USA
[2] Harvard Univ, Sch Med, Boston, MA USA
[3] Childrens Hosp Boston, Div Gastroenterol & Nutr, Boston, MA USA
[4] Dana Farber Canc Inst, Dept Med Oncol, Boston, MA 02115 USA
[5] Brigham & Womens Hosp, Channing Div Network Med, Boston, MA 02115 USA
[6] Harvard Univ, Sch Publ Hlth, Dept Nutr, Boston, MA 02115 USA