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Authors
Ding, Lulu
Li, Xinying
Tang, Xue
Feng, Yuejing
Wang, Yi
Cheng, Jiejie
Sun, Mei
Zhou, Chengchao https://orcid.org/0000-0002-9364-3579
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Funding
Funding for this research was provided by:
National Science Foundation (71974117)
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Article History
Received: 8 February 2020
Accepted: 30 September 2020
First Online: 7 October 2020
Ethics approval and consent to participate
: The study protocol for this study was approved by the Ethical Committee of Shandong University School of Public Health and was in accordance with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The investigation was performed after the acquisition of written informed consents from all of the participants.
: Not applicable.
: The authors declare that they have no competing interests.
