1. Section of Adult and Pediatric Endocrinology, Diabetes and Metabolism, Department of Medicine, University of Chicago, Chicago, Illinois;
2. Division of Diabetes, Endocrinology and Metabolism, Department of Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee;
3. Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan;
4. Division of Gastroenterology, Department of Pediatrics and Communicable Diseases, University of Michigan, Ann Arbor, Michigan;
5. Program in Neuroscience, University of Michigan, Ann Arbor, Michigan;
6. Division of Metabolism, Endocrinology and Diabetes, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan;
7. Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, Tennessee;
8. Center for Stem Cell Biology, Vanderbilt University School of Medicine, Nashville, Tennessee;
9. Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee;
10. Departments of Medicine, Cell and Developmental Biology, the State University of New York Upstate Medical University, Syracuse, New York; and the
11. U.S. Department of Veterans Affairs Tennessee Valley Healthcare System, Nashville, Tennessee.