1. Department of Urology, Guy's and St Thomas' Hospital, London, UK
2. Department of Urology, Haukeland University Hospital, Bergen, Norway
3. Department of Clinical Medicine, University of Bergen, Bergen, Norway
4. Department of Medicine, Guy's and St Thomas' Hospital, London, UK
5. Department of Microbiology, Great Western Hospital, Swindon, UK
6. Department of Urology, University Hospital, Southampton, UK