[1] Univ British Columbia, Dept Med, Vancouver, BC V5Z 1M9, Canada
[2] Arthrit Res Ctr Canada, Richmond, BC, Canada
[3] Arthrit Res Ctr Canada, Vancouver, BC, Canada
[4] Univ British Columbia, Vancouver, BC V5Z 1M9, Canada
[5] Univ British Columbia, Arthrit Res Ctr, Vancouver, BC V5Z 1M9, Canada