1 From the Department of Neurology (E.M.M.S.), MS Center Amsterdam, Amsterdam University Medical Centers, The Netherlands; Department of Clinical Neurosciences (M.W.K.), University of Calgary, Canada; and Department of Community Health Sciences (M.W.K.), University of Calgary, Canada. e.strijbis@amsterdamumc.nl.
2 From the Department of Neurology (E.M.M.S.), MS Center Amsterdam, Amsterdam University Medical Centers, The Netherlands; Department of Clinical Neurosciences (M.W.K.), University of Calgary, Canada; and Department of Community Health Sciences (M.W.K.), University of Calgary, Canada.