1 Department of Neurology (B.A.d.J., Z.L.E.v.K.), Amsterdam Neuroscience, VUmc MS Center Amsterdam, VU University Medical Center; Department of Radiology & Nuclear Medicine (M.P.W.), VUmc MS Center, Amsterdam, The Netherlands; Department of Diagnostic and Interventional Neuroradiology (M.P.W.), Hannover Medical School, Hannover, Germany; and Departments of Hematology (P.M.S., M.E.D.C.), and Pathology (L.P., D.B., D.d.J.), VU University Medical Center, Amsterdam, The Netherlands.