1. Departments of Neurosurgery and Interventional Neuroradiology, Xuanwu Hospital, Capital Medical University, Beijing, China
2. Department of Neurosurgery, Beijing Hospital, National Center of Gerontology; Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing, China
3. David Geffen School of Medicine, Department of Neurology and Comprehensive Stroke Center, University of California, Los Angeles
4. Department of Neurosurgery, First Affiliated Hospital of Harbin Medical University, Harbin, China
5. Department of Cerebrovascular and Neurosurgery, Henan Provincial People’s Hospital, Zhengzhou University, Zhengzhou, China
6. Department of Neurosurgery, Tangdu Hospital of Air Force Medical University, Xi’an, China
7. Department of Neurology, Strategic Support Force Medical Center, Beijing, China
8. Department of Neurology, Qilu Hospital of Shandong University, Ji’nan, China
9. Department of Neurosurgery, Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
10. Peking University Clinical Research Institute, Peking University First Hospital, Beijing, China
11. Neuroendovascular Program, Massachusetts General Hospital, Harvard Medical School, Boston
12. Department of Medical Imaging, Toronto Western Hospital, University of Toronto, Toronto, Ontario, Canada
13. Departments of Radiology and Neurology, University of Iowa Hospitals and Clinics, Iowa City
14. for the CASSISS Trial Investigators