Quan Shen, Wen Zhang, Shixing Yang, Zhibiao Yang, Yan Chen, Li Cui, Jianguo Zhu and Xiuguo Hua*
* Corresponding author: Xiuguo Hua huaxiuguo@yahoo.com
BMC Veterinary Research 2012, 8:155 doi:10.1186/1746-6148-8-155
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