1. From the Department of Internal Medicine, University of Minnesota Medical School, Minneapolis, MN;
2. The University of Texas School of Public Health, Houston, TX;
3. National Heart, Lung, and Blood Institute, Bethesda, MD;
4. HealthPartners Research Foundation, Minneapolis, MN;
5. Kaiser Permanente of Georgia, Tucker, GA;
6. the Department of Nephrology and Hypertension, Marshfield Clinic, Marshfield, WI;
7. the Department of Medicine, University of Illinois College of Medicine, Peoria, IL;
8. the Department of Internal Medicine, Ohio State University, Columbus, OH;
9. the Department of Medicine, Howard University, Washington, DC