1. Division of Cardiovascular Sciences and the DeBakey Heart Center, Department of Medicine, Baylor College of Medicine, Houston, Texas
2. Division of Diabetes, Endocrinology and Metabolism, Baylor College of Medicine, Houston, Texas
3. Indus Instruments, Webster, Texas
4. Department of Medicine, Houston Methodist, Texas
5. Center for Bioenergetics, Houston Methodist Hospital Research Institute, Texas
6. Section of Geriatrics, Department of Medicine, Baylor College of Medicine, Houston, Texas