Agafonova, Elena V.
Krestnikova, Lidiia V.
Salmakova, Alexandra V.
Isaeva, Guzel Sh.
Syrykh, Elvira V.
Article History
First Online: 3 August 2018
Compliance with Ethical Standards
: The study was approved by the Bioethics Committee at the Kazan Research Institute of Epidemiology and Microbiology (the minutes No. 31 dated on 02.12.2016).
: The authors declare that they have no conflict of interest.