1. Department of Medicine, North Mississippi Medical Center, Tupelo
2. Division of Nephrology, University of Tennessee Health Science Center, Memphis
3. Department of Preventive Medicine, University of Tennessee Health Science Center, Memphis
4. John W. Demming Department of Medicine, Tulane University School of Medicine, New Orleans, Louisiana
5. Harold Simmons Center for Chronic Disease Research and Epidemiology, Division of Nephrology and Hypertension, University of California–Irvine, Orange
6. Long Beach VA Medical Center, Long Beach, California
7. Nephrology Section, Memphis VA Medical Center, Memphis, Tennessee