1. Dow Division of Health Services Research, Department of Urology, University of Michigan Medical School, Ann Arbor, Michigan
2. Department of Urology, Vanderbilt University Medical Center, Nashville, Tennessee
3. Department of Urology, University of Alabama at Birmingham Heersink School of Medicine, Birmingham, Alabama
4. Litholink Corporation, Laboratory Corporation of America Holdings, Itasca, Illinois
5. Division of Nephrology, Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, Michigan
6. NorthShore University HealthSystem, Evanston, Illinois