Gao, Qiguo
Shi, Songmei
Liu, Yudong
Pu, Quanming
Liu, Xiaohuan
Zhang, Ying
Zhu, Liquan
Funding for this research was provided by:
the Chongqing Natural Science Foundation (cstc2012jjB80010)
the Fundamental Research Funds for the Central Universities (XDJK2010B010)
the National Basic Research Program of China (2012CB113900)
the Natural Science Foundation of China (30900986, 30971849, 31572127)