Intrathecal Mesenchymal Stem Cells in Progressive Multiple Sclerosis: A Randomized, Double-Blind, Placebo-Controlled Trial (SMART-MS). - Kvistad CE; Kråkenes T; Holmøy T; Eidem LE; Steffensen L; Wesnes K; Rojewski M; Eichele T; Wergeland S; Gavasso S; Barsnes H; Assmus J; et al. (Neurology, 2026)