1. Academic Urology Unit; University of Aberdeen; Aberdeen UK
2. Health Services Research Unit; University of Aberdeen; Aberdeen UK
3. Department of Biostatistics; University of Liverpool; Liverpool UK
4. Department of Anesthesiology; University of Groningen; University Medical Center Groningen; Groningen The Netherlands
5. Department of Urology; Aberdeen Royal Infirmary; Aberdeen UK
6. Health Economics Group; Institute of Health and Society; University of Newcastle; Newcastle UK
7. Department of Urology; University of Minnesota; Minneapolis MN USA
8. Minneapolis VA Health Care System; Minneapolis MN USA
9. Department of Urology; University Hospital; St. Etienne France