[1] McGill Univ, Dept Psychiat, Montreal, PQ, Canada
[2] McGill Univ, Dept Epidemiol Biostat & Occupat Hlth, Montreal, PQ, Canada
[3] McGill Univ, Dept Med, Montreal, PQ, Canada
[4] McGill Univ, Sch Nursing, Montreal, PQ, Canada
[5] McGill Univ, Jewish Gen Hosp, Lady Davis Inst Med Res, Montreal, PQ H3T 1E2, Canada
[6] McGill Univ, Jewish Gen Hosp, Div Rheumatol, Montreal, PQ H3T 1E2, Canada
[7] McGill Univ, Jewish Gen Hosp, Dept Psychiat, Montreal, PQ H3T 1E2, Canada
[8] San Diego State Univ, Dept Psychol, San Diego, CA 92182 USA