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Article History

Received: 23 May 2020

Accepted: 30 July 2020

First Online: 3 August 2020

Compliance with ethical standards

:

: The authors declare that they have no conflicts of interest.

: This research was approved by The Board of Ethics in Biomedical Research at University of Medicine and Pharmacy at Ho Chi Minh City.

: “I have read and understand the above consent form, I certify that I am 18 years old or older, and by selecting “Yes” below, I indicate my willingness to voluntarily join in the study.”

: “I understand that the information will be published without my name attached, but that full anonymity cannot be guaranteed. I understand that the text and any pictures published in the article will be available on the internet and may be seen by the general public. The pictures and text may also appear on other websites or in print, may be translated into other languages or used for commercial purposes.”

: Not applicable