- Correspondence to Professor Young Ho Lee, Division of Rheumatology, Korea University Medical Cente, 126-1, Anma-Dong 5-Ga, Sungbuk-Ku, Seoul, 136-705, Republic of Korea;
- Received 31 October 2017
- Accepted 1 November 2017
- Published in print 9 November 2017.
- Published online 10 November 2017.
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