Li, Xiuhong
Guo, Hongbo
Qi, Yuexin
Liu, Hailong
Zhang, Xiaoru
Ma, Pengda
Liang, Zongsuo
Dong, Juane
Funding for this research was provided by:
the National Natural Science Foundation of China (No. 31170274)
the Chinese Universities Scientific Fund (QN2013035)
the Natural Science Basic Research Plan in Shaanxi Province of China (2013JQ3006)