For citations:

Smagina IV, Lunev KV, Elchaninova SA. Vitamin D status in patients with multiple sclerosis: an association with insolation, disease course, and HLA-DRB1 gene polymorphism. Nevrologiya, neiropsikhiatriya, psikhosomatika = Neurology, Neuropsychiatry, Psychosomatics. 2020;12(3):63-68. https://doi.org/10.14412/2074-2711-2020-3-63-68