1. From Sahlgrenska sjukhuset, Umeå lasarett, and University of Göteborg, Göteborg
2. Department of Urology, Kärnsjukhuset Skövde, and University of Umeå, Umeå, Sweden
3. Departments of Pathology and Microbiology, and Eppley Institute for Research on Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska