1. Department of Urology; Maastricht University Medical Centre; Maastricht The Netherlands
2. Department of Urology; University Antwerpen; Universiteitsplein 1 Wilrijk Belgium
3. European Graduate School of Neuroscience (EURON); Maastricht University; Maastricht The Netherlands
4. Department of Statistics and Methodology; Maastricht University; Maastricht The Netherlands
5. Uro-Physiology Research Group; Medical and Dental School, University of Newcastle Upon Tyne; Tyne England