Wang, Xing
Wu, Ying
Liu, Xiaowei
Chen, Jianyong
Zhen, Congmian
Ma, Li
Hou, Denglu
Funding for this research was provided by:
the National Natural Science Foundation of China (10804026)
Natural Science Foundation of Hebei Province (A2013205101)
the National Natural Science Foundation of China (51101049)
Natural Science Foundation of Hebei Province (A2014205051)
Hebei talent engineering (A201400119)