AUTHOR=Fernández-Majada Vanesa , García-Díaz María , Torras Núria , Raghunath Michael , Martínez Elena TITLE=Editorial: When the Shape Does Matter: Three-Dimensional In Vitro Models of Epithelial Barriers JOURNAL=Frontiers in Bioengineering and Biotechnology VOLUME=8 YEAR=2020 URL=https://www.frontiersin.org/journals/bioengineering-and-biotechnology/articles/10.3389/fbioe.2020.617361 DOI=10.3389/fbioe.2020.617361 ISSN=2296-4185