1 Division of Endocrinology, Diabetes and Metabolism, Department of Medicine; University of Minnesota, Minneapolis, 516 Delaware St SE, MMC 101, Minneapolis, MN 55455, E-mail: Shres053@umn.edu.
2 Harvard Medical School, Division of Endocrinology, Beth Israel Deaconess Medical Center, Boston, Massachusetts, E-mail: jhenness@bidmc.harvard.edu.