1 From the Department of Neurology (Y.O., I.T.-I., S.S., I.Y.), Faculty of Medicine and Graduate School of Medicine, Hokkaido University; Department of Diagnostic Imaging (T.H.), Hokkaido University Graduate School of Medicine; and Department of Neurology (T.Y.), Kyoto Prefectural University of Medicine.
2 From the Department of Neurology (Y.O., I.T.-I., S.S., I.Y.), Faculty of Medicine and Graduate School of Medicine, Hokkaido University; Department of Diagnostic Imaging (T.H.), Hokkaido University Graduate School of Medicine; and Department of Neurology (T.Y.), Kyoto Prefectural University of Medicine. yabe@med.hokudai.ac.jp.