[1] BC Canc Agcy, Vancouver, BC, Canada
[2] McGill Univ, Montreal, PQ, Canada
[3] Univ Hlth Network, Princess Margaret Canc Ctr, Toronto, ON, Canada
[4] Univ Ottawa, Ottawa Hosp Res Inst, Ottawa, ON, Canada
[5] Univ Toronto, Toronto Gen Hosp, Dept Surg, Toronto, ON, Canada
[6] Ottawa Hosp, Ctr Canc, Ottawa, ON, Canada
[7] Tom Baker Canc Clin, Calgary, AB, Canada
[8] Queens Univ, Kingston, ON, Canada
[9] Canadian Canc Trials Grp, Kingston, ON, Canada