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Authors
Lam, Nguyen Duc https://orcid.org/0000-0003-3563-7688
Anh, Nguyen Duy
Ha, Nguyen Thi Thu
Vinh, Truong Quang
Anh, Vu Thi Mai
Kien, Vu Duy https://orcid.org/0000-0002-4333-8912
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Article History
Received: 23 May 2019
Accepted: 6 August 2019
First Online: 16 August 2019
Ethics approval and consent to participate
: All secondary data used in this study previously existed in the public domain of UNICEF (). Identifying information for subjects in the dataset was removed. Informed consent was obtained from all study participants.
: Not applicable.
: The authors declare that they have no competing interests.
