Huang, Zhi http://orcid.org/0000-0003-2599-653X
Jiang, Fu-xiang
Li, Jian
Jiang, Dan
Xiao, Ti-gang
Zeng, Ju-hua
Article History
Received: 15 March 2018
Accepted: 8 November 2018
First Online: 19 November 2018
Ethics approval and consent to participate
: Informed consent was signed by caregiver of children before the interview. The project was approved by Huaihua Women’s Federation and Municipal Commission of Health and Family Planning (No. 201563).
: Not applicable.
: The authors declare that they have no competing interests.
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