Received: 19 January 2021
Accepted: 9 April 2021
First Online: 19 April 2021
: The “National Internal Migrant Dynamic Monitoring Survey, 2017” data is publicly available to authorized researchers who have been given permission by the Migrant Population Service Center, and written informed consents were obtained from all participants. The analysis of public access data was exempted by the local IRB; as this involved analyzing de-identified existing data, ethical approval was not required.
: Not applicable.
: No competing interests in this study.