1. Department of Urology, Division of Health Services Research, 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. Massachusetts General Hospital, Department of Urology, Boston, Massachusetts