Su, Jian
Ye, Qing
Zhang, Dandan
Zhou, Jinyi
Tao, Ran
Ding, Zhen
Lu, Gan
Liu, Jiannan
Xu, Fei
Article History
Received: 11 December 2020
Accepted: 10 March 2021
First Online: 15 March 2021
Declarations
:
: The study protocol was reviewed and approved by the ethics committee of National Center for Chronic Disease Prevention and Control in accordance with the Declaration of Helsinki. Written informed consents were obtained from all participants before the study. All personal identifiable information was deleted prior to data analysis.
: Not applicable.
: None of the authors has any conflict of interest to declare.