1. Department of Surgery (Division of Urology), Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada.
2. Lawson Health Research Institute, London, Ontario, Canada.
3. Department of Urology, University of British Columbia, Vancouver, British Columbia, Canada.
4. Department of Microbiology and Immunology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada.