1. School of Veterinary Medicine and Science, University of Nottingham, Sutton Bonington, LE12 5RD, UK
2. Department of Pathology, Weill Cornell Medical College, New York, NY 10065, USA
3. Bridge Pathology Ltd., Bristol, BS7 0BJ, UK
4. Department of Urology, Mayo Clinic, Rochester, MN 55905, USA