Received: 23 May 2021
Accepted: 17 September 2021
First Online: 30 September 2021
: The ethical review committee of the National University of Ho Chi Minh City, Vietnam approved the study (Approval No: 702/ĐHQG-KHCN). Written informed consent was mandatory for entry into the study, this was requested from a parent or guardian from those aged < 18 years.
: Not applicable.
: The authors declare that they have no competing interests.