| Author information:
Kuznetsov Alexander A., Doctor of the Maternity Ward,
Maternity Clinic № 17, PhD Student of Obstetrics and Gy-
necology Department, FSBEI HE I. P. Pavlov SPbSMU
MOH Russia;
Romanovsky Artem N., Doctor of the Maternity Ward,
Maternity Clinic № 17, Assistant of Department of Women’s
Reproductive Health, North-Western State Medical Univer-
sity named after I. I. Mechnikov, Assistant of Department of
Obstetrics, Gynecology and Reproductology, St. Petersburg
State University;
Shlykova Anna V., Doctor of the Maternity Ward, Ma-
ternity Clinic №1 7; PhD Student of Obstetrics and Gyne-
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