1. VA Tennessee Valley Healthcare System, Nashville, TN
2. Division of Diabetes, Endocrinology, and Metabolism, Department of Medicine, Vanderbilt University School of Medicine, Nashville, TN
3. Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, TN
4. Vanderbilt Center for Stem Cell Biology, Vanderbilt University Medical Center, Nashville, TN
5. Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN