- Correspondence to Dr Naoshi Nishina, Division of Rheumatology, Department of Internal Medicine, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan;
- Received June 18, 2013
- Revised November 11, 2013
- Accepted December 3, 2013
- First published December 13, 2013.
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