1. Michael DeGroote School of Medicine, McMaster University, Hamilton, ON, Canada
2. Department of Radiology, McMaster University, Hamilton, ON, Canada
3. Department of Diagnostic Imaging, Juravinski Hospital and Cancer Centre, Hamilton Health Sciences, Canada
4. Department of Radiology, Radiation Oncology and Medical Physics, University of Ottawa, Ottawa, ON, Canada
5. Mallinckrodt Institute of Radiology, Washington University School of Medicine, USA