1 From the MS Clinic (G.V.M.), Belfast City Hospital, Northern Ireland, UK; and Max Rady College of Medicine (J.J.M.), Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Canada. gavin.mcdonnell@belfasttrust.hscni.net.
2 From the MS Clinic (G.V.M.), Belfast City Hospital, Northern Ireland, UK; and Max Rady College of Medicine (J.J.M.), Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Canada.