Cognitive function is associated with risk of conversion to secondary progressive multiple sclerosis: A cross-sectional study. - Mirmosayyeb, Omid; Mohammadi, Ida; Rajai Firouzabadi, Shahryar; Vaheb, Saeed; Yazdan Panah, Mohammad; Fuchs, Tom A.; Weinstock-Guttman, Bianca; Shaygannejad, Vahid (PLoS ONE, 2026)