AUTHOR=Puetz Volker , Strbian Daniel , Nguyen Thanh N. , Nagel Simon TITLE=Editorial: Challenges in Posterior Circulation Ischemic Stroke JOURNAL=Frontiers in Neurology VOLUME=12 YEAR=2021 URL=https://www.frontiersin.org/journals/neurology/articles/10.3389/fneur.2021.789836 DOI=10.3389/fneur.2021.789836 ISSN=1664-2295