[1] Univ British Columbia, Dept Med, Vancouver, BC, Canada
[2] British Columbia Ctr Subst Use, 400-1045 Howe St, Vancouver, BC V6Z 2A9, Canada
[3] Simon Fraser Univ, Fac Hlth Sci, Burnaby, BC, Canada
[4] British Columbia Ctr Dis Control, Vancouver, BC, Canada
[5] Ctr Gender & Sexual Hlth Equ, Vancouver, BC, Canada
[6] Univ Montreal, Ecole Sante Publ, Montreal, PQ, Canada
[7] Ctr Rech Sante Publ CReSP, Montreal, PQ, Canada