- Correspondence to Tsutomu Takeuchi; Division of Rheumatology, Department of Internal Medicine, School of Medicine, Keio University, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan;
- Accepted 25 February 2012
- Published in print 1 September 2012.
- Published online 8 August 2012.
- Published first 5 May 2012.
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