For citations:

Kalachev V.N., Zakharenkova T.N., Kozlov A.E., Osipkina O.V. Neurohumoral and biochemical markers of prolonged second stage of labor. Health and Ecology Issues. 2021;18(1):115-124. (In Russ.) https://doi.org/10.51523/2708-6011.2021-18-1-16