1. From the Department of Neurology (J.B., A.E.M.B., M.P., M.A.A.M.d.B., Y.S.C., R.F.N., J.M.d.V., M.J.T.), Erasmus University Medical Center, Rotterdam, the Netherlands; Neurology Unit (S.M., S.F., D.A.), Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Italy; Department of Immunology (M.W.J.S.), Erasmus University Medical Center, Rotterdam; and Central Diagnostic Laboratory (J.G.M.C.D.), Maastricht UMC+, the Netherlands.