[1] Toronto Western Hosp, Toronto, ON, Canada
[2] Univ Toronto, Toronto, ON, Canada
[3] Univ Toronto, Univ Hlth Network, Psoriat Arthrit Program, Ctr Prognosis Studies Rheumat Dis,Krembil Res Ins, Toronto, ON, Canada
[4] Univ Toronto, Toronto Western Hosp, Krembil Res Inst, Dept Med, Toronto, ON, Canada