[1] Univ Ottawa, Fac Med, Ottawa, ON, Canada
[2] Univ Ottawa, Dept Radiol, Civ Campus,1053 Carling Ave,Room C120, Ottawa, ON K1Y 4E9, Canada
[3] Ottawa Hosp, Civ Campus,1053 Carling Ave,Room C120, Ottawa, ON K1Y 4E9, Canada
[4] Univ Amsterdam, Acad Med Ctr, Dept Clin Epidemiol, Amsterdam Publ Hlth Res Inst, Amsterdam, Netherlands
[5] Univ Amsterdam, Acad Med Ctr, Dept Biostat & Bioinformat, Amsterdam Publ Hlth Res Inst, Amsterdam, Netherlands
[6] Ottawa Hosp, Res Inst, Clin Epidemiol Program, Ottawa, ON, Canada