[1] British Columbia Ctr Dis Control, Vancouver, BC, Canada
[2] Hlth Initiat Men, Vancouver, BC, Canada
[3] Univ Toronto, Toronto, ON, Canada
[4] McGill Univ, Montreal, PQ, Canada
[5] British Columbia Ctr Excellence Hiv Aids, Vancouver, BC, Canada
[6] Community Based Res Ctr Gay Mens Hlth, Vancouver, BC, Canada
[7] Ryerson Univ, Toronto, ON, Canada