1. Department of Urology; Isala; Zwolle The Netherlands
2. Dry Bed Center; Isala Noorderboog; Meppel The Netherlands
3. Department of Urology; Pediatric Urology Center; Radboudumc Amalia Children's Hospital; Radboud University Medical Center; Nijmegen The Netherlands
4. Department of General Practice; University of Groningen; University Medical Centre Groningen; Groningen The Netherlands