Funding for this research was provided by:
National Natural Science Foundation of China (71672031, 71502094, 71632005, 71332002)
The Humanities and Social Science Foundation of the Ministry of Education of China (16YJA630018)
The Fundamental Research Funds for the Central Universities of China (N160602001)
The Social Science Foundation of Liaoning in China (L17AGL005)
National Nature Science Foundation of China (71772138, 71472137)
Article History
Received: 3 April 2018
Revised: 2 July 2018
Accepted: 27 July 2018
First Online: 6 August 2018
Compliance with ethical standards
:
: On behalf of all authors, the corresponding author states that there is no conflict of interest.