- 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 26 October 2016
- Revised 28 December 2016
- Accepted 13 February 2017
- Published in print 1 May 2017.
- Published online 4 May 2017.
- Published first 4 March 2017.
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