Funding for this research was provided by:
Natural Science Foundation of Guangdong Province (2018A030310283)
Special Fund for Basic Research Business Expenses in the Central Universities of Sun Yat-sen University (18zxxt28)
Received: 24 June 2018
Accepted: 8 January 2019
First Online: 18 January 2019
Ethics approval and consent to participate
: This study is a secondary analysis of a public access dataset of the National Internal Migrant Dynamic Monitoring Survey (NIMDMS) 2014. It doesn’t contain any identifiable private information of the participants. This survey was funded and organised by the National Population and Family Planning Commission of the People’s Republic of China (NPFPC). Written informed consent was obtained by the trained investigators from all individuals included in the study. We have got the permission to use this dataset from the NPFPC. The Institutional Review Broad (IRB) of the School of Public Health, Sun Yat-sen University in China approved this study ( No.011).
: Not Applicable.
: The authors declare that they have no competing interests.
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