- Correspondence to Dr Tianxiao Li, Department of Cerebrovascular Disease, Henan Provincial People's Hospital, Zhengzhou 450003, China; ; Dr Zhang Hongqi, Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, Beijing, 100053, China;
- Received April 2, 2020
- Revised April 23, 2020
- Accepted April 26, 2020
- First published May 19, 2020.
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