1. Department of Urology, Queen’s University, Kingston, Ontario, Canada
2. Department of Biostatistics and Epidemiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
3. National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
4. Department of Pathology, University of Colorado Anschutz Medical Campus, Aurora, Colorado
5. Departments of Microbiology & Immunology and Otolaryngology-Head and Neck Surgery, Drexel University College of Medicine, Philadelphia, Pennsylvania