Received: 22 July 2020
Accepted: 19 November 2020
First Online: 25 November 2020
Ethics approval and consent to participate
: This study was approved by the Ethical Committee of Vietnam Military Medical University (No. 1238/QĐ-HVQY). Informed consent was obtained from all the participants.
: Not Applicable.
: The authors declare that they have no competing interests.