1. Department of Medical Imaging, St. Joseph's Health Care London, 268 Grosvenor St, Rm C0-251, London, ON N6V 4V2, Canada.
2. Department of Medical Imaging, London Health Sciences Centre, London, ON, Canada.
3. Department of Medical Imaging, Grand River Hospital, Kitchener, ON, Canada.
4. Department of Health Sciences, Wilfrid Laurier University, Waterloo, ON, Canada.