- Correspondence to Dr Hongqi Zhang, Department of Neurosurgery, Xuanwu Hospital, 45, Changchun Ave, XiCheng District, Beijing 100053, China; Dr Renzhi Wang, Department of Neurosurgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, P. R. China;
- Received January 29, 2016
- Revised April 22, 2016
- Accepted April 29, 2016
- First published May 24, 2016.
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