Funding for this research was provided by:
National Natural Science Foundation of China (11528102)
National Natural Science Foundation of China (11571282)
National Natural Science Foundation of China (71401134)
National Natural Science Foundation of China (71571144)
National Natural Science Foundation of China (71171164)
Simons Foundation (280601)
China Scholarship Council (201606290192)
Fundamental Research Funds for the Central Universities (JBK1801065, JBK120509)
Fundamental Research Funds for the Central Universities (14TD0046)
Article History
Received: 7 May 2017
Accepted: 16 May 2018
First Online: 30 May 2018