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Article History

Received: 6 June 2022

Revised: 9 December 2022

Accepted: 24 January 2023

First Online: 31 January 2023

Declarations

:

: The 2018 China Migrants Dynamic Survey was approved by the National Health and Family Planning Commission Ethics Review Board, and all participants were required to provide written informed consent. Informed consent was obtained from all participants and from a parent and/or legal guardian of minors. This second data analysis was approved by the Biomedical Ethics Committee of Southern Medical University (Acceptance Number: NFYKDX002). All methods were carried out in accordance with relevant guidelines and regulations.

: Not applicable.

: The authors declare that they have no competing interest.