[1] Hosp Sick Children, Neurosci & Mental Hlth, Toronto, ON M5G 1X8, Canada
[2] Univ Manitoba, Dept Internal Med, Winnipeg, MB, Canada
[3] Univ Manitoba, Dept Community Hlth Sci, Winnipeg, MB R3T 2N2, Canada
[4] Univ Oxford, Dept Physiol Anat & Genet, Oxford, England
[5] MRC, Funct Genom Unit, Oxford, England
[6] McGill Univ, Dept Epidemiol Biostat & Occupat Hlth, Montreal, PQ, Canada
[7] Univ Toronto, Dept Nutr Sci, Toronto, ON, Canada
[8] Univ Toronto, Dept Lab Med & Pathobiol, Toronto, ON, Canada
[9] Univ British Columbia, Fac Med, Dept Med Genet & Neurol, Vancouver, BC, Canada
[10] McGill Univ, Montreal Neurol Inst, Brain Imaging Ctr, Montreal, PQ, Canada
[11] McGill Univ, Montreal Neurol Inst, Neuroimmunol Unit, Montreal, PQ, Canada
[12] McGill Univ, Montreal Neurol Inst, Expt Therapeut Program, Montreal, PQ, Canada
[13] Childrens Hosp Philadelphia, Div Neurol, Philadelphia, PA 19104 USA