Xiaoqing Li*, Yingjun Zheng, Adrian Liau, Biao Cai, Dongqing Ye, Feng Huang, Xiaorong Sheng, Fuyang Ge, Liu Xuan, Shun Li and Jing Li
* Corresponding author: Xiaoqing Li lxqlxq2005@126.com
BMC Public Health 2012, 12:272 doi:10.1186/1471-2458-12-272
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