1. Department of Urology, Vanderbilt University Medical Center, Nashville, Tennessee
2. Department of Internal Medicine, Veterans Administration, Veterans Affairs Medical Center, Ann Arbor, Michigan
3. Nephrology Division of Internal Medicine, University of Michigan School of Medicine, Ann Arbor, Michigan
4. Dow Division of Health Services Research, Department of Urology, University of Michigan, Ann Arbor, Michigan
5. Division of Nephrology, Department of Medicine, Stanford University School of Medicine, Stanford, California
6. Veterans Affairs Palo Alto Health Care System, Palo Alto, California
7. Department of Urology, Stanford University School of Medicine, Stanford, California
8. Division of Nephrology, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan