- Correspondence to Dr Xiangyang Huang, Department of Rheumatology,The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China, ; and Dr Timothy B Niewold;
- Received 14 October 2017
- Revision received 30 November 2017
- Accepted 13 December 2017
- Published online 13 January 2018.
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