1 From the Department of Neurology (K.E.Z.), Kiel University, Germany; and Department of Neurology and Ophthalmology (C.S.), Michigan State University, East Lansing. k.zeuner@neurologie.uni-kiel.de.
2 From the Department of Neurology (K.E.Z.), Kiel University, Germany; and Department of Neurology and Ophthalmology (C.S.), Michigan State University, East Lansing.