Yunxia Liu, Shiwen Jiang, Yanxun Liu, Rui Wang, Xiao Li, Zhongshang Yuan, Lixia Wang and Fuzhong Xue*
* Corresponding author: Fuzhong Xue xuefzh@sdu.edu.cn
International Journal of Health Geographics 2011, 10:50 doi:10.1186/1476-072X-10-50
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