1. Department of Urology, University of Washington, Seattle, Washington
2. Arbor Research Collaborative for Health, Ann Arbor, Michigan
3. Northwestern University Feinberg School of Medicine, Chicago, Illinois
4. Washington University School of Medicine, St Louis, Missouri
5. Duke University Medical Center, Durham, North Carolina
6. Department of Urology, University of Iowa, Iowa City, Iowa
7. University of Michigan, Ann Arbor, Michigan
8. National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland