- 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 10 June 2015
- Revised 6 October 2015
- Accepted 27 October 2015
- Published in print 1 June 2016.
- Published online 10 May 2016.
- Published first 19 November 2015.
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- Data supplement 1 - Online supplement
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