[1] Univ Calgary, Tom Baker Canc Ctr, Calgary, AB, Canada
[2] Ottawa Hosp, Div Hematol, Ottawa, ON, Canada
[3] Ottawa Hosp Res Inst, Ottawa, ON, Canada
[4] Univ Ottawa, Ottawa Hosp Res Inst, Ottawa, ON, Canada
[5] Univ Saskatchewan, Saskatoon Canc Ctr, Saskatoon, SK, Canada
[6] Ottawa Hlth Res Inst, Ottawa, ON, Canada
[7] Ottawa Hlth Res Inst, Clin Epidemiol Program, Ottawa, ON, Canada
[8] McMaster Univ, Juravinski Hosp, Hamilton, ON, Canada
[9] McMaster Univ, Canc Ctr, Hamilton, ON, Canada
[10] London Hlth Sci Ctr, Dept Hematol, London, ON, Canada
[11] Ottawa Hosp Res Inst, Clin Epidemiol, Ottawa, ON, Canada