Article History
Received: 28 May 2020
Accepted: 16 September 2020
First Online: 24 September 2020
Compliance with Ethical Standards
:
: The authors declare that they have no conflicts of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This study was approved by the Ethics Board of the Hanoi Medical University.
: Informed consents were obtained from all individual participants included in the study.