Tsuyoshi Shirai, Hiroshi Fujii*, Masao Ono, Kyohei Nakamura, Ryu Watanabe, Yumi Tajima, Naruhiko Takasawa, Tomonori Ishii and Hideo Harigae
* Corresponding author: Hiroshi Fujii hfujii@med.tohoku.ac.jp
Arthritis Research & Therapy 2012, 14:R157 doi:10.1186/ar3897