Zakaria, Muhammad
Xu, Junfang
Karim, Farzana
Cheng, Feng
Funding for this research was provided by:
China Medical Board (202032)
Article History
Received: 3 January 2019
Accepted: 15 July 2019
First Online: 24 July 2019
Ethics approval and consent to participate
: Ethical approval for the study was provided by Institutional Review Board for Human Subject Research, Research Centre for Public Health at Tsinghua University. Written informed consent was provided to the parents/LAR of participants prior to data collection for this study.
: Not applicable.
: The authors declare that they have no competing interests.