1. Kidney Research Institute, Division of Nephrology, University of, Seattle
2. Department of Biostatistics, University of Washington, Seattle
3. Department of Research and Evaluation, Kaiser Permanente Southern California, Pasadena
4. Kaiser Permanente Northwest Center for Health Research, Portland, Oregon
5. Department of Medicine, Kaiser Permanente Colorado, Denver
6. Meyers Primary Care Institute, Worcester, Massachusetts
7. University of Colorado Hospital, Aurora
8. Marshfield Clinic Research Foundation, Marshfield, Wisconsin
9. Kaiser Permanente Northern California Division of Research, Oakland
10. Department of Epidemiology, University of California, San Francisco
11. Department of Biostatistics, University of California, San Francisco
12. Department of Medicine, University of California, San Francisco