Anna Grenabo Bergdahl1, Erik Holmberg2, Sue Moss3, Jonas Hugosson4. 1. Department of Urology, Institute of Clinical Sciences, Sahlgrenska Academy at the Sahlgrenska University Hospital, Göteborg, Sweden. Electronic address: anna.grenabo@vgregion.se. 2. Department of Oncology, Institute of Clinical Sciences, Sahlgrenska Academy at the Sahlgrenska University Hospital, Göteborg, Sweden. 3. Centre for Cancer Prevention, Wolfson Institute for Preventive Medicine, Queen Mary University of London, London, UK. 4. Department of Urology, Institute of Clinical Sciences, Sahlgrenska Academy at the Sahlgrenska University Hospital, Göteborg, Sweden.