- Correspondence to Dr Xinjian Yang, Department of Interventional Neuroradiology, Beijing Neurosurgical Institute and Beijing Tiantan Hospital, Capital Medical University, TiantanXili 6, Dongcheng District, Beijing 100050, China;
- Received February 17, 2017
- Revised March 9, 2017
- Accepted March 10, 2017
- First published April 4, 2017.
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