1. Department of Urology, Turku University Hospital, Turku, Finland;
2. Department of Urology, Aarhus University Hospital, Aarhus, Denmark;
3. School of Medical Sciences, Faculty of Medicine and Health, University of Örebro, Örebro, Sweden;
4. Norwegian University of Science and Technology, Trondheim, Norway;
5. Department of Urology, Landspitali University Hospital, Reykjavik, Iceland