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Khanh, Nguyen Cong https://orcid.org/0000-0002-2034-9483
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First Online: 18 October 2019
Compliance with Ethical Standards
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: 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.
: Informed consent was obtained from all individual participants included in the study.
: The Author declares that he has no conflict of interest.
