[1] CHU St Justine, Res Ctr, Montreal, PQ, Canada
[2] Univ Alberta, Fac Med & Dent, Edmonton, AB, Canada
[3] Univ Manitoba, Coll Pharm, Winnipeg, MB, Canada
[4] Ottawa Hosp Res Inst, Ottawa, ON, Canada
[5] McGill Univ, Dept Epidemiol Biostat & Occupat Hlth, Montreal, PQ, Canada
[6] Univ Ottawa, Dept Epidemiol & Community Med, Ottawa, ON, Canada
[7] Alberta Hlth Serv, Edmonton, AB, Canada
[8] Univ Manitoba, Manitoba Ctr Hlth Policy, Winnipeg, MB, Canada