1. Department of Neurology National Cerebral and Cardiovascular Center Osaka Japan
2. Department of Neurology Tokyo Metropolitan Geriatric Hospital and Institute of Gerontology Tokyo Japan
3. Department of Neurology Nara Medical University Nara Japan
4. Department of Pathology National Cerebral and Cardiovascular Center Osaka Japan
5. Department of Neurosurgery National Cerebral and Cardiovascular Center Osaka Japan
6. Department of Radiology National Cerebral and Cardiovascular Center Osaka Japan
7. Department of Neurosurgery Graduate School of Medical Sciences Kyushu University Fukuoka Japan
8. Department of Cerebrovascular Medicine National Cerebral and Cardiovascular Center Osaka Japan