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. Dialysis Unit; Obi Clinic; Osaka Osaka Japan
3. Fielding School of Public Health at UCLA; Los Angeles CA USA
4. Nephrology Section; Tibor Rubin Veterans Affairs Medical Center; Long Beach CA USA
5. Department of Medical Statistics; Osaka City University Graduate School of Medicine; Osaka Osaka Japan
6. Division of Nephrology; University of Tennessee Health Science Center; Memphis TN USA
7. Nephrology Section; Memphis VA Medical Center; Memphis TN USA
8. Department of Comprehensive Kidney Disease Research; Osaka University Graduate School of Medicine; Suita Osaka Japan