Donnell, Carole A. Baggerly, Christine B. French, Jennifer L. Alianoand Harjit P. Bhattoa; Nutrients 2020, 12, 988; doi: 10.3390/nu12040988. 3 Vitamin D levels appear to play role in COVID-19 mortality rates, Amanda Morris; Northwestern University; May 7, 2020. 4 Martineau A. R, Jolliffe D. A, Hooper R. L, Greenberg L, Aloia J. F, Bergman P. et al. Vitamin D supple-mentation to prevent acute respiratory tract infec-tions: systematic review and meta-analysis of individual participant data. BMJ. 2017;
356: i6583. https://dx. doi. org/10.1136/bmj. i6583. 5 http://72. rospotrebnadzor. ru/content/465/102717/