For citations:
Malyavskaya S.I., Karamyan V.G., Kostrova G.N., Lebedev A.V. Assessment of vitamin D level in the umbilical cord blood of the Arkhangelsk city infants born in winter time. Rossiyskiy Vestnik Perinatologii i Pediatrii (Russian Bulletin of Perinatology and Pediatrics). 2018;63(1):46-50. (In Russ.) https://doi.org/10.21508/1027-4065-2018-63-1-46-50