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Xue-Feng Xu, Ying Lv, Wei-Zhong Gu, Li-Li Tang, Jia-Kai Wei, Li-Yan Zhang and Li-Zhong Du*
* Corresponding author: Li-Zhong Du dulizhong@yahoo.com.cn
Respiratory Research 2013, 14:20 doi:10.1186/1465-9921-14-20