1. From the Division of Urology, Department of Surgery, J. Bordet Institute, Department of Pathology, Erasmus University Hospital, Laboratory of Histopathology, Faculty of Medicine, Université Libre de Bruxelles and Fonds National de la Recherche Scientifique, Brussels, Department of Urology, Ghent University Hospital, Ghent, Department of Urology, A. Z. Stuyvenberg, Antwerp, Department of Urology, Sint-Maertens Ziekenhuis and Department of Urology, Kliniek Maria’s Voorzienigheid, Kortrijk, Belgium