For citations:
Belokrinitskaya T.E., Iozefson S.A., Frolova N.I., Brum O.Yu. Critical obstetric conditions during pandemic (COVID-19) and pre-pandemic years. Fundamental and Clinical Medicine. 2021;6(3):56-63. (In Russ.) https://doi.org/10.23946/2500-0764-2021-6-3-56-63