Luo, Rui
Chen, Fumei
Yuan, Chunyong
Ma, Xinyu
Zhang, Cai
Article History
Received: 23 July 2019
Accepted: 9 October 2019
First Online: 30 December 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 Beijing Normal University with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.