Vinnikov, Denis
Romanova, Zhanna
Kapanova, Gulnara
Raushanova, Aizhan
Kalmakhanov, Sundetgali
Zhigalin, Alexander
Article History
Received: 4 January 2021
Accepted: 15 February 2021
First Online: 23 February 2021
Ethics approval and consent to participate
: 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 consent to participate. All methods were carried out in accordance with relevant guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests.