- Correspondence to Professor Sang-Cheol Bae, Hanyang University Hospital for Rheumatic Diseases, 222 Wangsimni-ro, Seongdong-gu, Seoul 133-792, Republic of Korea;
- Received March 17, 2015
- Revised February 4, 2016
- Accepted February 6, 2016
- First published February 23, 2016.
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