1. Division of Renal Disease and Hypertension; The George Washington University; Washington DC
2. Center for Clinical Epidemiology and Biostatistics; University of Pennsylvania; Philadelphia Pennsylvania
3. Department of Nephrology and Hypertension; Cleveland Clinic; Cleveland Ohio
4. Department of Internal Medicine; University of Michigan Health System; Ann Arbor Michigan
5. Department of Medicine; University of Pennsylvania Medical Center; Philadelphia Pennsylvania
6. Renal; Electrolyte and Hypertension Division; Perelman School of Medicine, University of Pennsylvania; Philadelphia Pennsylvania
7. Department of Medicine; Jesse Brown VA Medical Center; University of Illinois Medical Center; Chicago Illinois
8. Department of Epidemiology; Tulane University; New Orleans Louisiana
9. Department of Pathology and Laboratory Medicine; University of Pennsylvania Medical Center; Philadelphia Pennsylvania
10. Division of Kidney; Urologic and Hematologic Diseases; National Institute of Diabetes and Digestive and Kidney Diseases; Bethesda Maryland
11. Clinical Epidemiology Unit; Perelman School of Medicine, University of Pennsylvania; Philadelphia Pennsylvania