Anne-Françoise Spinoit1, Filip Poelaert2, Piet Hoebeke2. 1. Department of Urology, Ghent University Hospital, De Pintelaan 185, 9000 Gent, Belgium. Electronic address: afspinoit@hotmail.com. 2. Department of Urology, Ghent University Hospital, De Pintelaan 185, 9000 Gent, Belgium.