[1] Univ British Columbia, Dept Pathol & Lab Med, Vancouver, BC, Canada
[2] Univ British Columbia, Ctr Blood Res, Vancouver, BC, Canada
[3] Univ British Columbia, Edwin S H Leong Hlth Aging Program, Vancouver, BC, Canada
[4] Univ British Columbia, Fac Med, Vancouver, BC, Canada
[5] British Columbia Womens Hosp & Hlth Ctr, Womens Hlth Res Inst, Vancouver, BC, Canada
[6] Univ British Columbia, Fac Sci, Vancouver, BC, Canada
[7] British Columbia Womens Hosp & Hlth Ctr, Oak Tree Clin, Vancouver, BC, Canada
[8] Univ Montreal, Fac Med, Dept Anesthesiol & Pain Med, Montreal, PQ, Canada
[9] Univ Montreal, Fac Med, Dept Med, Montreal, PQ, Canada
[10] Canadian HIV AIDS & Chron Pain Soc Global Pain & H, Ottawa, ON, Canada
[11] Univ British Columbia, Woodward Lib, Vancouver, BC, Canada
[12] Univ British Columbia, Dept Pathol & Lab Med, G135-2211 Wesbrook Mall, Vancouver, BC V6T 2B5, Canada