1. Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
2. Neuro-Urology and Spinal Unit, Careggi University Hospital, Firenze, Italy
3. Department of Urology, Medical University of Vienna, Vienna, Austria
4. Department of Urology, Sahlgrenska University Hospital, Göteborg, Sweden
5. BG-Klinik Tübingen, Tübingen, Germany
6. Sheffield Teaching Hospitals NHS Foundation Trust, Royal Hallamshire Hospital, Sheffield, United Kingdom