V. B. Cavenaghi, F. M. Dobrianskyj, G. S. do Olival, R. P. C. D. Carneiro, and C. P. Tilbery, “Characterization of the first symptoms of multiple sclerosis in a Brazilian center: cross-sectional study”, Sao Paulo Med J, vol. 135, no. 3, pp. 222–225, Jun. 2017.