Zou, Shengqi
Wu, Xinchun
Li, Xiaowei
Article History
Received: 20 May 2019
Accepted: 19 June 2019
First Online: 15 July 2019
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in this study involving human participants were in accordance with the ethical standards of Beijing Normal University and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: All participants in the study provided informed consent.