1. Department of Urology, University of Miami Miller School of Medicine, Miami, Florida
2. Section of Urology and Renal Transplantation, Virginia Mason Medical Center, Seattle, Washington
3. Department of Urology, University of California, Irvine, Irvine, California
4. Division of Gerentology and Geriatric Medicine, Department of Medicine, University of Washington, Seattle, Washington
5. Department of Statistics, University of Washington, Seattle, Washington