From Phenotypes to Spectrum: Rethinking RRMS, SPMS and PPMS in the Era of PIRA—A Framework Integrating PIRA, Smouldering-Associated Worsening, and Neurologic Reserve to Facilitate Earlier Recognition of Progression. - Vasilev, Georgi V.; Ivanova, Sonya; Milanov, Ivan (Neurology International, 2026)