1. Department of Urology, Institute of Clinical Sciences, Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden;
2. Department of Surgery, Institute of Clinical Sciences, Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden;
3. The Clinical Research Laboratory, Örebro University Hospital, Örebro, Sweden;
4. School of Medical Sciences, Örebro University, Örebro, Sweden