Derek J Rosario1, Liam Bourke2, Nancy L Keating3. 1. Academic Urology Unit, Department of Oncology, Royal Hallamshire Hospital, University of Sheffield, Sheffield, UK. Electronic address: d.j.rosario@sheffield.ac.uk. 2. Department of Primary Care and Public Health, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK. 3. Division of General Internal Medicine, Brigham and Women's Hospital, and Department of Health Care Policy, Harvard Medical School, Boston, MA, USA.