Levels of circulating cytokines in children with multiple sclerosis with different effectiveness of interferon therapy oleh T. V. Radygina, S. V. Petrichuk, O. V. Kurbatova, D. G. Kuptsova, A. P. Fisenko, E. L. Semikina, E. V. Freydlin, L. M. Abdullaeva, B. I. Bursagova