- Correspondence to Professor Zezhang Zhu, Department of Spine Surgery, Drum Tower Hospital of Nanjing University Medical School, Zhongshan Road No. 321, Nanjing 210008, China;
- Received October 26, 2016
- Revised December 28, 2016
- Accepted February 13, 2017
- First published March 4, 2017.
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