Wang, Anxin
Su, Zhaoping
Liu, Xiaoxue
Yang, Yuling
Chen, Shuohua
Wang, Suzhen
Luo, Yanxia
Guo, Xiuhua
Zhao, Xingquan
Wu, Shouling
Funding for this research was provided by:
National Natural Science Foundation of China (81530087)
National Natural Science Foundation of China (81473071)
Natural Science Foundation of Shandong Province (ZR2013HM045)
National Bureau of Statistics of China (2013LY013)