Modeling of cognitive impairment by disease duration in multiple sclerosis: a cross-sectional study. oleh Anat Achiron, Joab Chapman, David Magalashvili, Mark Dolev, Mor Lavie, Eran Bercovich, Michael Polliack, Glen M Doniger, Yael Stern, Olga Khilkevich, Shay Menascu, Gil Hararai, Micharel Gurevich, Yoram Barak