[1] Univ Toronto, Temerty Fac Med, Toronto, ON, Canada
[2] Univ Ottawa, Ottawa Hosp, Dept Med Imaging, Ottawa, ON, Canada
[3] Univ British Columbia, Fac Med, Dept Radiol, Vancouver, BC, Canada
[4] McGill Univ Hlth Ctr, Dept Diagnost Radiol, Montreal, PQ, Canada
[5] Univ Toronto, Dept Med Imaging, Toronto, ON, Canada
[6] Univ Toronto, Univ Med Imaging Toronto, Univ Hlth Network, Toronto, ON, Canada
[7] Univ Hlth Network, Toronto Gen Hosp, 1 PMB-298, 585 Univ Ave, Toronto, ON M5G 2N2, Canada