Jia Wang, Xue Zhou, Wei Xia, Cai-Hong Sun, Li-Jie Wu*, Jian-Li Wang and Akemi Tomoda
* Corresponding author: Li-Jie Wu wljhyd@ems.hrbmu.edu.cn
BMC Health Services Research 2012, 12:7 doi:10.1186/1472-6963-12-7