[1] McGill Univ, Dept Family Med, Montreal, PQ, Canada
[2] St Marys Hosp, St Marys Res Ctr, Montreal, PQ, Canada
[3] Dalhousie Univ, Dept Community Hlth Epidemiol, Halifax, NS, Canada
[4] Univ Toronto, Dept Family & Community Med, Toronto, ON, Canada
[5] Womens Coll Hosp, Peter Gilgan Ctr Womens Cancers, Toronto, ON, Canada
[6] Univ Family Med Grp St Mary, St Marys Hosp Ctr, Montreal, PQ, Canada