- Correspondence to Dr Chuan-ju Liu, Rm 1608, HJD, Department of Orthopaedic Surgery, New York University Medical Center, 301 East 17th Street, New York NY10003, USA;
- Received April 15, 2019
- Revised June 29, 2019
- Accepted July 1, 2019
- First published July 13, 2019.
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