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