1. Department of Medical Imaging, The Ottawa Hospital, 1053 Carling Ave, Ottawa, ON K1Y 4E9, Canada
2. Present affiliation: Peterborough Regional Health Centre, Peterborough, ON, Canada
3. Present affiliation: The Moncton Hospital, Moncton, NB, Canada
4. University of Ottawa, Ottawa, ON, Canada
5. Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada
6. Department of Diagnostic Imaging, Juravinski Hospital and Cancer Centre, Hamilton Health Sciences, McMaster University, Hamilton, ON, Canada