- Correspondence to Professor Tsutomu Takeuchi, Division of Rheumatology, Department of Internal Medicine, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan;
- Received August 14, 2015
- Revised October 26, 2015
- Accepted November 24, 2015
- First published January 5, 2016.
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- Data supplement 1 - Online supplement
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