[1] Dalhousie Univ, Dept Community Hlth & Epidemiol, Halifax, NS B3H IV7, Canada
[2] Nova Scotia Hlth, Dept Surg, Halifax, NS B3H 2Y9, Canada
[3] McMaster Univ, Dept Oncol, Hamilton, ON L8V 5C2, Canada
[4] Princess Margaret Canc Res Inst, Dept Support Care, Toronto, ON M5G 0A3, Canada
[5] Ontario Inst Canc Res, Toronto, ON M5G 0A3, Canada
[6] Univ Toronto, Dept Family & Community Med, Toronto, ON M5G 1V7, Canada