[1] Univ British Columbia, Fac Med, Dept Obstet & Gynaecol, Vancouver, BC, Canada
[2] Providence Hlth Care Res Inst, Ctr Hlth Evaluat & Outcome Sci, Vancouver, BC, Canada
[3] Royal Coll Surgeons Ireland, Dublin, Ireland
[4] Univ British Columbia, Fac Pharmaceut Sci, Vancouver, BC, Canada
[5] Univ Toronto, Factor Inwentash Fac Social Work, Toronto, ON, Canada