1. Division of Urology, Albany Medical College, Albany, New York
2. Social and Scientific Systems, Durham, North Carolina
3. National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
4. Departments of Urology, James Buchanan Brady Urological Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland
5. Loyola University Medical Center, Maywood, Illinois