1. From the Departments of Clinical Neurosciences (J.I.R., R.K.) and Pathology and Laboratory Medicine (D.N.), and the Hotchkiss Brain Institute (J.I.R.), University of Calgary, Alberta, Canada; Neuroimmunology Centre, Department of Neurology (J.I.R.), Royal Melbourne Hospital; and Clinical Outcomes Research Unit, Department of Medicine (J.I.R.), University of Melbourne, Australia.