Tomohiro Okagawa, Satoru Konnai, Ryoyo Ikebuchi, Saori Suzuki, Tatsuya Shirai, Yuji Sunden, Misao Onuma, Shiro Murata and Kazuhiko Ohashi*
* Corresponding author: Kazuhiko Ohashi okazu@vetmed.hokudai.ac.jp
Veterinary Research 2012, 43:45 doi:10.1186/1297-9716-43-45