1 Institute for Neuroimmunology and Multiple Sclerosis (S.C.H., J.-P.S., S.C.R., K.Y., M.A.F., C.H.), Department of Neurology (S.C.H., J.-P.S., S.C.R., K.Y., C.H.), and Department of Diagnostic and Interventional Neuroradiology (B.H.), University Medical Center Hamburg-Eppendorf, Germany.