For citations:
Shrayner E.V., Petukhova S.K., Khavkin A.I., Kokh N.V., Lifshits G.I. Association of genetic prerequisites of vitamin D deficiency with severity of past COVID-19 infection. Experimental and Clinical Gastroenterology. 2022;(6):50-55. (In Russ.) https://doi.org/10.31146/1682-8658-ecg-202-6-50-55