1. Departments of Medicine (J.L., B.Y., P.L.B., D.J.D.), Toronto General Hospital, Banting and Best Diabetes Center, University of Toronto, Toronto, Ontario, Canada M5G 2C4
2. Departments of Physiology (I.I., A.M., L.D., P.L.B.) Toronto General Hospital, Banting and Best Diabetes Center, University of Toronto, Toronto, Ontario, Canada M5G 2C4