1. National Defense Medical College, Division of Neurology, Department of Internal Medicine 3, 3-2 Namiki, Tokorozawa, Saitama-ken, 359-8513, Japan Tel.: ; Fax: ,
2. Kinki University School of Medicine, Department of Neurology, 377-2 Ohno-Higashi, Osaka-Sayama, Osaka, 589-8511, Japan Tel.: ; Fax: