Fu, Yuwei
Lin, Weiwei
Yang, Yuan
Du, Ranran
Gao, Dongping
Article History
Received: 13 January 2021
Accepted: 16 April 2021
First Online: 8 May 2021
Declarations
:
: All experimental protocols were approved by the National Population Health Data Center Population Health Data Archive, which provided data support for the study. All methods were carried out in accordance with relevant guidelines and regulations. All survey data was treated anonymously in strict accordance with the statistics law of the People’s Republic of China. The informed consents were obtained by all person in the sample.
: Not applicable.
: The authors declare that they have no competing interests.