Xu, Dongjuan
Gao, Jie
Chen, Liqin
Mou, Huanyu
Wang, Xiaorong
Ling, Jiying
Wang, Kefang http://orcid.org/0000-0003-2985-6593
Funding for this research was provided by:
National Planning Office of Philosophy and Social Science (14CSH063)
Article History
Accepted: 8 April 2019
First Online: 17 April 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The study was approved by the Institutional Review Board of Shandong University.
: Informed consent was obtained from all individual participants included in the study.