1. Division of Cardiovascular Medicine, Department of Medicine, University of California, San Diego, California, USA;
2. Kidney Health Research Collaborative, Division of Nephrology, Department of Medicine, University of California, San Francisco, California, USA;
3. Department of Medicine, University of Washington, Seattle, Washington, USA;
4. Department of Epidemiology, University of Pittsburgh Graduate School of Public Health, Pittsburgh, Pennsylvania, USA;
5. Division of Nephrology, Department of Medicine, Tufts University School of Medicine, Boston, Massachusetts, USA;
6. College of Public Health and Human Sciences, Oregon State University, Corvallis, Oregon, USA.