[1] Harvard Univ, Sch Med, Beth Israel Deaconess Med Ctr, Div Endocrinol, Boston, MA 02215 USA
[2] Harvard Univ, Sch Med, Beth Israel Deaconess Med Ctr, Dept Med, Boston, MA 02215 USA
[3] Florida State Univ, Program Neurosci, Dept Nutr Food & Exercise Sci, Tallahassee, FL 32306 USA
[4] Toronto Gen Hosp, Dept Med, Toronto, ON M5G 1L7, Canada
[5] Univ Toronto, Banting & Best Diabet Ctr, Toronto, ON M5G 1L5, Canada
[6] Harvard Univ, Sch Med, Beth Israel Deaconess Med Ctr, Dept Neurol, Boston, MA 02215 USA