AUTHOR=Luchicchi Antonio , Preziosa Paolo , 't Hart Bert TITLE=Editorial: “Inside-Out” vs “Outside-In” Paradigms in Multiple Sclerosis Etiopathogenesis JOURNAL=Frontiers in Cellular Neuroscience VOLUME=15 YEAR=2021 URL=https://www.frontiersin.org/journals/cellular-neuroscience/articles/10.3389/fncel.2021.666529 DOI=10.3389/fncel.2021.666529 ISSN=1662-5102