Berdina, Olga http://orcid.org/0000-0003-0930-6543
Madaeva, Irina http://orcid.org/0000-0003-3423-7260
Bolshakova, Svetlana http://orcid.org/0000-0002-3104-4212
Polyakov, Vladimir http://orcid.org/0000-0001-6243-9391
Bugun, Olga http://orcid.org/0000-0002-2162-3683
Rychkova, Liubov http://orcid.org/0000-0001-5292-0907
Article History
Received: 14 August 2020
Accepted: 26 February 2021
First Online: 12 March 2021
Declarations
:
: Olga Berdina, Irina Madaeva, Svetlana Bolshakova, Vladimir Polyakov, Olga Bugun and Liubov Rychkova declare that they have no conflict of interest. Statements by each author are attached.
: All procedures performed in this study involving human participants were in accordance with the ethical standards of the national research committee and with the 1964 Helsinki declaration and its later amendments. This study has been approved by the Scientific Centre for Family Health and Human Reproduction Problems Committee on Biomedical Ethics.
: Informed consent was obtained from all individual participants included in the study.