AUTHOR=Messina Roberta , Goadsby Peter J. , Filippi Massimo TITLE=Editorial: Functional and Structural Brain Alterations in Headache: A Trait or a State? JOURNAL=Frontiers in Neurology VOLUME=11 YEAR=2020 URL=https://www.frontiersin.org/journals/neurology/articles/10.3389/fneur.2020.00859 DOI=10.3389/fneur.2020.00859 ISSN=1664-2295