1. Institute of Mechanical, Process and Energy Engineering, School of Engineering and Physical Sciences; Heriot-Watt University; Edinburgh EH14 4AS UK
2. Servicio de Oncología Médica; Hospital 12 de Octubre; Madrid 28041 Spain
3. Edinburgh Urological Cancer Group, Division of Pathology Laboratories, Institute of Genetics and Molecular Medicine; University of Edinburgh, Western General Hospital; Crewe Road South Edinburgh EH4 2XU UK
4. Department of Urology, NHS Lothian; Western General Hospital; Crewe Road South Edinburgh EH4 2XU UK