1. Department of Oncology, Medical Faculty, Oslo University Hospital and University of Oslo, Oslo, Norway;
2. Martini-Klinik, Prostate Cancer Center, Hamburg, Germany;
3. Department of Oncology, Oslo University Hospital, Oslo, Norway;
4. Vestre Viken Trust, Drammen, Norway;
5. Department of Urology, Medical Faculty, University of Oslo, Oslo, Norway;
6. Aleris Medical Center, Oslo, Norway;
7. Oslo Centre for Biostatistics and Epidemiology, Oslo University Hospital, Oslo, Norway