Article History
Received: 4 May 2021
Accepted: 22 July 2021
First Online: 9 October 2021
Declarations
:
: The authors declare that they have no competing interests.
: The study was approved by the local Committee on Bioethics of the School of Public Health of al-Farabi Kazakh National University.
: Every participant signed an informed written consent to participate. All methods were carried out in accordance with relevant guidelines and regulations.
: Not applicable.