[1] St Pauls Hosp, British Columbia Ctr Excellence HIV AIDS, Vancouver, BC V6Z 1Y6, Canada
[2] Univ British Columbia, Sch Populat & Publ Hlth, Vancouver, BC V6H 1Y6, Canada
[3] British Columbia Ctr Dis Control, Vancouver, BC, Canada
[4] Univ British Columbia, St Pauls Hosp, Dept Med, Vancouver, BC V6H 1Y6, Canada