Funding for this research was provided by:
Fundamental Research Funds for the Central Universities (A0920502051411-5)
the National Natural Science Foundation of China (51377138)
the National Natural Science Foundation of China (51271155)
the National Science and Technology Projects Foundation (2013DFA51050)
the National Science and Technology Projects Foundation (2013GB114003-1)
the National Science and Technology Projects Foundation (2014AA032701)