[1] St Pauls Hosp, British Columbia Ctr Excellence HIV AIDS, Urban Hlth Res Initiat, Vancouver, BC V6Z 1Y6, Canada
[2] Univ British Columbia, Interdisciplinary Studies Grad Program, Green Coll, Vancouver, BC V6T 1Z1, Canada
[3] Univ British Columbia, Fac Med, Vancouver, BC V6T 1Z3, Canada
[4] Mitsampan Harm Reduct Ctr, Thai AIDS Treatment Act Grp, Bangkok 10900, Thailand