1 MD Undergraduate Program, University of British Columbia, Vancouver, BC, Canada; Department of Radiology, Vancouver General Hospital, University of British Columbia, Vancouver, BC, Canada. Electronic address: bogong.ustc@gmail.com.
2 MD Undergraduate Program, University of British Columbia, Vancouver, BC, Canada; Department of Radiology, Vancouver General Hospital, University of British Columbia, Vancouver, BC, Canada.
3 Department of Radiology, Vancouver General Hospital, University of British Columbia, Vancouver, BC, Canada.
4 Department of Radiology, University of Chicago Medical Center, Chicago, Illinois.