Funding for this research was provided by:
Fundamental Research Funds for the Central Universities (2017MS058)
National Natural Science Foundation of China (11501543)
University of Chinese Academy of Sciences (Y65201VY00, Y551037Y00)
University of Chinese Academy of Sciences (Y65302V1G4)
National Natural Science Foundation of China (61370034)
China Scholarship Council
Army Research Office (W911NF-15-1-0223)
Article History
Received: 29 January 2017
Accepted: 3 August 2017
First Online: 14 August 2017