[1] McGill Univ, Fac Dent, Montreal, PQ H3A 2B2, Canada
[2] McGill Univ, Fac Med, Dept Biostat & Epidemiol & Occupat Hlth, Montreal, PQ, Canada
[3] McGill Univ, Jewish Gen Hosp, Lady Davis Inst Med Res, Montreal, PQ H3T 1E2, Canada
[4] Univ Montreal, Fac Med Dent, Montreal, PQ H3C 3J7, Canada
[5] Univ Montreal, Ctr Rech Sci Neurol, Montreal, PQ H3C 3J7, Canada
[6] Univ Toronto, Fac Dent, Toronto, ON, Canada
[7] McGill Univ, Fac Med, Dept Physiol, Montreal, PQ, Canada