Sun, Yan http://orcid.org/0000-0002-4704-5578
Zhang, Chen http://orcid.org/0000-0003-4057-4124
Dong, Kunxiang
Lang, Maoxiang
Funding for this research was provided by:
Shandong Provincial Higher Educational Social Science Program of China (J18RA053, J18RA053)
Article History
Received: 27 March 2018
Revised: 25 July 2018
Accepted: 8 August 2018
First Online: 18 August 2018
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.