1. Department of Internal Medicine, University of Missouri-Columbia School of Medicine, Columbia, Missouri.
2. Division of Nephrology, University of Missouri-Columbia School of Medicine, Columbia, Missouri.
3. Department of Diabetes and Cardiovascular Laboratory, University of Missouri-Columbia School of Medicine, Columbia, Missouri.
4. Department of Harry S Truman VA Medical Center, University of Missouri-Columbia School of Medicine, Columbia, Missouri.
5. Department of Medical Pharmacology and Physiology, University of Missouri-Columbia School of Medicine, Columbia, Missouri.
6. Division of Endocrinology, University of Missouri-Columbia School of Medicine, Columbia, Missouri.