- Correspondence to Dr Antonia F Chen, Department of Orthopaedic Surgery, Rothman Institute, Thomas Jefferson University, 125 S 9th Street, Suite 1000, Philadelphia, PA 19107, USA;
- Received November 20, 2016
- Revised March 31, 2017
- Accepted April 3, 2017
- First published May 15, 2017.
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