Funding for this research was provided by:
Ministry of Education and Training, Vietnam (Project number: KHGD/ 16-20. ĐT.016.)
Article History
First Online: 9 June 2020
Compliance with Ethical Standards
:
: Authors declare that there are no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.
: All procedures performed in the study involving human participants were in accordance with the ethical standards of the responsible committee on human experimentation and with the Helsinki Declaration of 1975, as revised in 2000.