1. Cardiology Section, Veterans Affairs Medical Center, Denver, Colorado;
2. Division of Cardiology, University of Colorado School of Medicine, Aurora, Colorado;
3. Division of Endocrinology and Metabolism, University of Colorado School of Medicine, Aurora, Colorado;
4. Department of Integrative Physiology, University of Colorado, Boulder, Colorado; and
5. Endocrinology and Metabolism Section, Veterans Affairs Medical Center, Denver, Colorado