1Cerebrovascular Division, Department of Internal Medicine, National Cardiovascular Center, 5-7-1 Fujishirodai, Suita, Osaka, 565-8565, Japan. Telephone 0081 6 833 5012
2Cerebrovascular Division, Department of Internal Medicine, National Cardiovascular Center, Japan,
bDepartment of Neurology, Brain Research Institute, Niigata University, Japan,
cDepartment of Speech Therapy, Takeda General Hospital, Japan