For citations:
Vlasov YV, Polyarnaya NG, Boyko AN. Comparison of medical and social characteristics and quality of life of patients with primary- and secondary-progressive multiple sclerosis. Nevrologiya, neiropsikhiatriya, psikhosomatika = Neurology, Neuropsychiatry, Psychosomatics. 2021;13(1S):39-44. (In Russ.) https://doi.org/10.14412/2074-2711-2021-1S-39-44