1. Harold Simmons Center for Kidney Disease Research and Epidemiology, Division of Nephrology and Hypertension University of California Irvine Medical Center Orange CA USA
2. Division of Nephrology, Department of Medicine Samsung Changwon Hospital, Sungkyunkwan University School of Medicine Changwon Korea
3. Nephrology Section VA Long Beach Healthcare System Long Beach CA USA
4. Division of Nephrology, Department of Internal Medicine Ewha Womans University College of Medicine, Ewha Medical Research Center Seoul Korea
5. Division of Nephrology, Department of Medicine University of Tennessee Health Science Center Memphis TN USA
6. Nephrology Section Memphis Veterans Affairs Medical Center Memphis TN USA