[1] Harvard Med Sch, Joslin Diabet Ctr, Sect Integrat Physiol & Metab, Boston, MA 02115 USA
[2] Harvard Med Sch, Dept Med, Boston, MA 02115 USA
[3] Boston Childrens Hosp, Div Gastroenterol Hepatol & Nutr, Boston, MA USA
[4] Univ Bergen, KG Jebsen Ctr Diabet Res, Dept Clin Sci, Bergen, Norway
[5] Boston Childrens Hosp, Dept Pathol, Boston, MA USA
[6] Harvard Med Sch, Boston, MA USA
[7] AstraZeneca R&D, Cardiovasc & Metab Dis iMed, Molndal, Sweden