1. Department of Radiology, Hospital da Luz Lisbon, 1500-650 Lisboa, Portugal
2. Faculty of Medicine, Clinical Research CIBIT/ICNAS, University of Coimbra, 3004-504 Coimbra, Portugal
3. Department of Urology, Hospital da Luz Lisbon, 1500-650 Lisboa, Portugal
4. Nova Medical School, Nova University of Lisbon, 1169-056 Lisbon, Portugal
5. Department of Medical Imaging, Ghent University Hospital, 9000 Ghent, Belgium
6. CEAUL, Centro de Estatística e Aplicações, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal