1. Department of Urology, Veterans Affairs Health Care System Minneapolis
2. Department of Urology, University of Minnesota, Minneapolis, Minnesota
3. Departments of Urology, University of Wisconsin, St. Louis, Missouri
4. Madison, Wisconsin, Washington University, St. Louis, Missouri
5. State University of New York-Brooklyn, Brooklyn
6. Department of Biostatistics, University of Minnesota, Minneapolis, Minnesota
7. Louisiana State University, Shreveport, Louisiana
8. Columbia University, New York, New York