[1] Queens Canc Res Inst, Div Canc Care & Epidemiol, Kingston, ON K7L 3N6, Canada
[2] Queens Univ, Dept Publ Hlth Sci, Kingston, ON, Canada
[3] Univ Bristol, Sch Social & Community Med, MRC ConDuCT Hub Trials Methodol Res 2, Bristol, Avon, England
[4] Univ Sydney, Sch Psychol, Sydney, NSW 2006, Australia
[5] Univ Birmingham, Sch Hlth & Populat Sci, Birmingham, W Midlands, England
[6] McMaster Univ, Juravinski Hosp, Hamilton, ON, Canada
[7] McMaster Univ, Ctr Canc, Hamilton, ON, Canada
[8] Univ Toronto, Princess Margaret Canc Ctr, Dept Radiat Oncol, Toronto, ON, Canada
[9] Queens Canc Res Inst, NCIC Clin Trials Grp, Kingston, ON K7L 3N6, Canada