1. Department of Neuro-urology, Balgrist University Hospital, University of Zürich, Zürich, Switzerland
2. Department of Urology, University Hospital Zürich, University of Zürich, Zürich, Switzerland
3. Swiss Paraplegic Research, Nottwil, Switzerland
4. Department of Health Sciences and Medicine, University of Lucerne, Lucerne, Switzerland
5. Department of Urology, Cantonal Hospital Aarau, Aarau, Switzerland
6. Department of Urology, Clinic for Urology, University Hospital Bonn, Bonn, Germany
7. Department of Urology, Winterthur Cantonal Hospital, Winterthur, Switzerland