For citations:
Vlasov Ya.V., Polyarnaya N.G., Fomina T.A., Lasch N.Yu., Guseva M.R., Boyko A.N. Secondary progressive sclerosis in Russia, medical and social characteristics of patients and urgent tasks of therapy. Medical alphabet. 2021;(3):7-13. (In Russ.) https://doi.org/10.33667/2078-5631-2021-3-7-13
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