1. Department of Cerebrovascular Medicine, National Cerebral and Cardiovascular Center, Suita, Japan
2. Institute for Biomedical Sciences, Iwate Medical University, Yahaba, Japan
3. Department of Stroke and Cerebrovascular Medicine, Kyorin University, Mitaka, Japan
4. Department of Neurosurgery, Nakamura Memorial Hospital, Sapporo, Japan
5. Department of Stroke Medicine, Kawasaki Medical School, Kurashiki, Japan
6. Department of Neurology, Kyoto Second Red Cross Hospital, Kyoto, Japan
7. Department of Neurology, Tokyo Saiseikai Central Hospital, Tokyo, Japan
8. Department of Neurology, Japanese Red Cross Kumamoto Hospital, Kumamoto, Japan
9. Division of Neurology, Department of Internal Medicine, Saga University Faculty of Medicine, Saga, Japan
10. Department of Diagnostic Imaging, Hokkaido University Graduate School of Medicine, Sapporo, Japan
11. Department of Neurology, National Cerebral and Cardiovascular Center, Suita, Japan
12. Department of Neurology, Yamagata Prefectural Central Hospital, Yamagata, Japan