Zhang, Youjie
Zhang, Xiaofan
Li, Jun
Zhong, Hua
Pan, Chen-Wei
Funding for this research was provided by:
National Natural Science Foundation of China (81502824, 81773449, 81560169)
the Association Foundation Program of Yunnan Province Science and Technology Department and Kunming Medical University (2019FE001(-096))
Article History
Received: 5 January 2020
Accepted: 16 November 2020
First Online: 23 November 2020
Ethics approval and consent to participate
: Ethics committee approval was obtained from the Institutional Review Board of Kunming Medical University. We carried out the study according to the tenets of the Declaration of Helsinki involving human participants and the approved guidelines. Additionally, we obtained written informed consents from at least one parent or legal guardian of each participant.
: Not applicable.
: Prof. Chen-Wei Pan is a member of the editorial board of BMC Public Health. The other authors declare that they have no competing interests.