1 Nephrology Section, Memphis VA Medical Center, Memphis, TN.
2 Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA.
3 Department of Medicine, Duke University, Durham, NC.
4 Division of Nephrology, University of Tennessee Health Science Center, Memphis, TN.
5 Department of Public Health Sciences, Division of Nephrology, Department of Medicine, University of Virginia, Charlottesville, VA.
6 Harold Simmons Center for Chronic Disease Research and Epidemiology, Division of Nephrology and Hypertension, University of California-Irvine, Orange, CA.