1. University Medical Center Utrecht; Department of Urology; Heidelberglaan 100 PO Box C04.236 Utrecht Netherlands 3584 CX
2. Erasmus University Medical Center; Department of Urology; PO Box 2040 Room NH-227 Rotterdam Netherlands 3000 CA
3. University Medical Center Utrecht; Julius Center for Health Sciences and Primary Care; PO Box 85500 Utrecht Netherlands 3508 GA
4. Central Military Hospital; Department of Urology; Utrecht Netherlands