1 Division of Neurology, Department of Medicine, McMaster University, Hamilton, Ontario, Canada.
2 Division of Rheumatology, Department of Medicine, McMaster University, Hamilton, Ontario, Canada.
3 Neuropathology Section, Department of Pathology and Molecular Medicine, Hamilton General Hospital, McMaster University, 237 Barton Street, Hamilton, Ontario, L8L 2X2, Canada. luj85@mcmaster.ca.