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Yongming Dai, Yunlian Tang, Fei He, Yang Zhang, Ailan Cheng, Runliang Gan* and Yimou Wu*
* Corresponding authors: Runliang Gan gan998@yahoo.com - Yimou Wu yimouwu@sina.com
Virology Journal 2012, 9:77 doi:10.1186/1743-422X-9-77