1. Department of Radiology, University of British Columbia Vancouver, Canada.
2. Department of Public Health, College of Public Health, Imam Abdulrahman bin Faisal University, Dammam, Saudi Arabia.
3. Department of Radiology, University of Calgary, Calgary, Canada.
4. Department of Radiology, University of Toronto, Ontario, Canada.
5. University of Wisconsin School of Medicine and Public Health Department of Radiology, Madison, Wisconsin, USA.
6. Department of Radiology, University of British Columbia, Vancouver, Canada.