1. From the Departments of Urology and Pathology, Herleu Hospital
2. Department of Urology, Rigshospitalet, University of Copenhagen, Copenhagen
3. Department of Urology, Aarhus Municipal Hospital, University of Aarhus, Aarhus
4. Department of Urology, Aalborg North Hospital, Aalborg, Denmark
5. Departments of Urology, Ashington, Nottingham and Withington Hospital, Great Britain