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Authors
Nikitina, Irina L. https://orcid.org/0000-0003-4013-0785
Kelmanson, Igor A. https://orcid.org/0000-0002-4449-2786
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Article History
Received: 14 May 2021
Revised: 29 July 2021
Accepted: 10 August 2021
First Online: 23 August 2021
Declarations
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: All procedures performed in study were in accordance with the ethical standards of the institutional and/or national research committee and with the 1975 Helsinki declaration and its later amendments or comparable ethical standards. The study was approved by the Institutional ethics committee.
: Informed consent for the participation in a scientific study was obtained from all mothers involved, and confidentiality was guaranteed.
: Not applicable
: The authors declare no competing interests.
