For citations:
Denisova T.G., Vasileva E.N., Sidorov A.E., Denisovа E.A., Levitskaya V.M., Sidorova T.N. Association of vitamin D deficiency and preterm birth. Сибирский научный медицинский журнал. 2023;43(5):143-147. (In Russ.) https://doi.org/10.18699/SSMJ20230515
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