J Rheumatol 2020; doi:10.3899/jrheum.191027
In the article footnotes, the corresponding authors should be Drs. C.C. Shieh and S.H. Lin, Institute of Clinical Medicine, National Cheng Kung University, 138 Sheng-Li Road, Tainan 70403, Taiwan. Email: cshieh{at}mail.ncku.edu.tw; shlin922{at}mail.ncku.edu.tw. We apologize for this error.
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