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Xiao-fei Cheng*, Xiao-yun Wu, Hui-zhong Wang, Yu-qiang Sun, Yong-sheng Qian and Lu Luo
* Corresponding author: Xiao-fei Cheng conicheng_xf@126.com
Virology Journal 2012, 9:113 doi:10.1186/1743-422X-9-113