1. Department of Cerebrovascular Medicine, National Cerebral and Cardiovascular Center, Suita, Japan
2. Department of Medical and Health Information Management, National Cerebral and Cardiovascular Center, Suita, Japan
3. Department of Neurology, Saiseikai Fukuoka General Hospital, Fukuoka, Japan
4. Department of Neurosurgery, Nakamura Memorial Hospital, Sapporo, Japan
5. Department of Stroke Neurology, Kohnan Hospital, Sendai, Japan
6. Stroke Center, Okayama Kyokuto Hospital, Okayama, Japan
7. Department of Stroke Science, Akita Cerebrospinal and Cardiovascular Center, Akita, Japan
8. Department of Neurology, Japanese Red Cross Kumamoto Hospital, Kumamoto, Japan
9. Medical Corporation ISEIKAI, Osaka, Japan
10. Shimane University School of Medicine, Izumo, Shimane, Japan
11. for the Japan Stroke Data Bank Investigators