1. Joint Department of Medical Imaging, University Health Network, Toronto, Ontario, Canada
2. Department of Radiology, Al Sabah Hospital, Kuwait City, Kuwait
3. Department of Medical Imaging, University of Toronto, Toronto, Ontario, Canada
4. Department of Radiation Oncology, University of Toronto, Toronto, Ontario, Canada
5. Department of Diagnostic Radiology, Yale Medical School, New Haven, Connecticut, USA
6. Department of Radiology, McGill University, Montreal, Quebec, Canada
7. Department of Radiology, New York University, New York, New York, USA