1. Departments of Urology (E.R., F.D., J.S.) University Hospital Nijmegen, 6500 HB, Nijmegen, The Netherlands;
2. Pathology (E.R., C.v.d.K., D.R.), University Hospital Nijmegen, 6500 HB, Nijmegen, The Netherlands;
3. Department of Pathology (G.M.), University of Colorado, Health Sciences Center, Denver, Colorado 80260, U.S.A.;
4. Department of Pathology and Companion Animals (J.S.), Veterinarian Faculty, University of Utrecht, 3508 TD, Utrecht, The Netherlands