1. Department of Neurology, Nippon Medical School, Tokyo, Japan
2. Department of Neurology, Seisho Hospital, Kanagawa, Japan
3. Department of Neurosurgery, Yokohamashintoshi Neurosurgical Hospital, Kanagawa, Japan
4. Department of Neurosurgery, Nagareyama Central Hospital, Chiba, Japan
5. Department of Neurology, Showa University Koto Toyosu Hospital, Tokyo, Japan
6. Department of Neurosurgery, National Hospital Organization Disaster Medical Center, Tokyo, Japan
7. Department of Neurosurgery, New Tokyo Hospital, Chiba, Japan
8. Department of Neurosurgery, Akiyama Neurosurgical Hospital, Kanagawa, Japan
9. Department of Neurology and Neurosurgery, Chiba Emergency Medical Center, Chiba, Japan
10. Department of Neurosurgery, Dokkyo Medical University Koshigaya Hospital, Saitama, Japan
11. Division of Stroke Prevention and Treatment, Department of Neurosurgery, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
12. Department of Neurosurgery, Tokyo Metropolitan Tama Medical Center, Tokyo, Japan
13. Department of Cerebrovascular Medicine, NTT Medical Center Tokyo, Tokyo, Japan
14. Department of Neurosurgery, Funabashi Municipal Medical Center, Chiba, Japan
15. Department of Neurosurgery, Mihara Memorial Hospital, Gunma, Japan
16. Department of Neurosurgery, Mito Medical Center, Ibaraki, Japan
17. Department of Neurosurgery, National Center for Global Health and Medicine, Tokyo, Japan
18. Department of Stroke and Cerebrovascular Medicine, Kyorin University Faculty of Medicine, Tokyo, Japan
19. Department of Endovascular Surgery, Tokyo Medical and Dental University, Tokyo, Japan
20. Department of Stroke, St. Marianna University Toyoko Stroke Center, Kanagawa, Japan
21. Department of Neurology, The Jikei University School of Medicine, Tokyo, Japan
22. Division of Neurology, Department of Medicine, Jichi Medical University Hospital, Tochigi, Japan
23. Department of Public health, Nippon Medical School Hospital, Tokyo, Japan