- Correspondence to Dr Zhiqi Zhang, Department of Joint Surgery, Sun Yat-sen University First Affiliated Hospital, Guangzhou 510080, China; ; Dr Weiming Liao;
- Received June 28, 2019
- Revised November 21, 2019
- Accepted December 7, 2019
- First published December 23, 2019.
This web only file has been produced by the BMJ Publishing Group from an electronic file supplied by the author(s) and has not been edited for content.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.