For citations:
Kondratyeva E.I., Loshkova E.V., Odinaeva N.D., Khavkin A.I., Ponomarenko Yu.B., Shubina Yu.F., Golenitskaya I.A., Pasnova E.V. Seasonal fluctuations in vitamin D levels in children with various diseases. Experimental and Clinical Gastroenterology. 2022;(6):5-13. (In Russ.) https://doi.org/10.31146/1682-8658-ecg-202-6-5-13