Funding for this research was provided by:
Ministry of Science and Technology (KC.10.15/16-20)
Ministry of Science and Technology, Vietnam (DM.10.DA/15)
Received: 18 October 2019
Revised: 2 January 2020
Accepted: 4 February 2020
First Online: 13 February 2020
Ethics approval and consent to participate
: This study was conducted in accordance with the amended Declaration of Helsinki. The institutional review board (scientific and ethical committee) of Van Hanh General Hospital (Ho Chi Minh City, Viet Nam, no. 084/2017/QD-NCKH) and Vietnam Military Academy 103 (Hanoi, Vietnam) approved the study, and all participants provided written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.