1. Department of Neurology National Cerebral and Cardiovascular Center Suita Japan
2. Department of Epidemiology for Community Health and Medicine Kyoto Prefectural University of Medicine Kyoto Japan
3. Department of Neurology Shiga University of Medical Science Otsu Japan
4. Department of Cerebrovascular Medicine National Cerebral and Cardiovascular Center Suita Japan
5. Department of Radiology National Cerebral and Cardiovascular Center Suita Japan
6. Shizuoka Graduate University of Public Health Shizuoka Japan