1. Department of Urology, Carver College of Medicine, University of Iowa, Iowa City, Iowa
2. Department of Pathology, Carver College of Medicine, University of Iowa, Iowa City, Iowa
3. Department of Biostatistics, College of Public Health, University of Iowa, Iowa City, Iowa
4. Department of Urology, University of California, San Francisco, San Francisco, California
5. Department of Urology, University of Minnesota, Minneapolis, Minnesota
6. Division of Urology, Department of Surgery, University of Utah, Salt Lake City, Utah
7. Department of Urology, Lahey Hospital and Medical Center, Burlington, Massachusetts