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Article History

Received: 24 February 2021

Accepted: 14 June 2021

First Online: 29 June 2021

Declarations

:

: All subjects provided their written informed consent for inclusion before participation in the study. The study was conducted in accordance with the Declaration of Helsinki, and the protocol was approved by the Ethics Committee of the West China School of Public Health and West China Fourth Hospital, Sichuan University.

: Not applicable.

: The authors declare that they have no conflicts of interest.