- 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 October 14, 2017
- Revision received November 30, 2017
- Accepted December 13, 2017
- First published January 13, 2018.
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