1 Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan.
2 Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan; Institute of Gerontology, University of Michigan, Ann Arbor, Michigan. Electronic address: mpapaleo@med.umich.edu.