1. Dow Division of Health Services Research, Department of Urology, University of Michigan, Ann Arbor, Michigan
2. Division of Hematology/Oncology, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan
3. VA Health Services Research & Development, Center for Clinical Management Research, VA Ann Arbor Healthcare System, Ann Arbor, Michigan
4. Division of Nephrology, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan
5. Department of Urology, Massachusetts General Hospital, Boston, Massachusetts