1 Diagnostic Imaging, Sir Charles Gairdner Hospital, Perth, Western Australia, Australia.
2 Joint Dept of Medical Imaging, University Health Network, Mt Sinai Hospital, Women's College Hospital, University of Toronto, Toronto, Ontario, Canada.
3 Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, Ontario, Canada.
4 Division of Urology, Department of Surgical Oncology, University Health Network, University of Toronto, Toronto, Ontario, Canada.