Hiroyoshi Ohta, Hiroshi Oka, Chie Usui, Masayuki Ohkura, Makoto Suzuki and Kusuki Nishioka*
* Corresponding author: Kusuki Nishioka imse-kn@tokyo-med.ac.jp
Arthritis Research & Therapy 2012, 14:R217 doi:10.1186/ar4056