- Correspondence to Dr Eun Bong Lee, Division of Rheumatology, Department of Internal Medicine, Seoul National University College of Medicine, 101 Daehak-ro, Jongno-gu, Seoul 03080, Korea;
- Received January 11, 2017
- Revised March 8, 2017
- Accepted April 9, 2017
- First published May 3, 2017.
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