AUTHOR=Sumowski James F. TITLE=Cognitive Reserve as a Useful Concept for Early Intervention Research in Multiple Sclerosis JOURNAL=Frontiers in Neurology VOLUME=6 YEAR=2015 URL=https://www.frontiersin.org/journals/neurology/articles/10.3389/fneur.2015.00176 DOI=10.3389/fneur.2015.00176 ISSN=1664-2295