[1] Hosp Sick Children, Diagnost Imaging Dept, Div Image Guided Therapy, Toronto, ON, Canada
[2] Univ Toronto, Dept Med Imaging, Toronto, ON, Canada
[3] McMaster Univ, Diagnost Imaging, Hamilton, ON, Canada
[4] Univ Dundee, Ctr Med Educ, Sch Med, Dundee, Scotland
[5] Hosp Sick Children, Room 2230A,555 Univ Ave, Toronto, ON M5G 1X8, Canada