1. Radiology Department, University of British Columbia/Vancouver General Hospital, Vancouver, Canada.
2. Faculty of Science, University of British Columbia, Vancouver, Canada.
3. Department of Radiology, Vancouver General Hospital, Vancouver, Canada.
4. Faculty of Medicine, University of British Columbia, Vancouver, Canada.
5. Ministry of Health Technical Office, Zagazig, Egypt.
6. Department of Radiology, University of Ottawa and The Ottawa Hospital Research Institute, Ottawa, Canada.
7. Department of Medical Imaging, Sunnybrook Health Sciences Centre, Toronto, Canada.
8. Department of Medical Imaging, The Ottawa Hospital, Ottawa, Canada.
9. Department of Medicine, University of British Columbia Centre for Health Evaluation and Outcomes Sciences, Vancouver, Canada.
10. Department of Clinical Radiology, Keck School of Medicine, University of Southern California, Los Angeles, California, USA.