1. Department of Urology, Herlev/Gentofte Hospital, Copenhagen, Denmark;
2. Department of Urology, Vestfold Hospital Trust, T⊘nsberg, Oslo, Norway;
3. Department of Urology, Skånes Universitetssjukhus, Malmö, Sweden;
4. Department of Urology, HYKS Sairaanhoitopiiri, Helsinki University central Hospital, Helsinki, Finland;
5. Department of Urology, Aarhus University Hospital, Aarhus N, Denmark;
6. Department of Urology, St. Olavs University Hospital, Trondheim, Norway