AUTHOR=Frontiers Production Office TITLE=Erratum: A Dense RNN for Sequential Four-Chamber View Left Ventricle Wall Segmentation and Cardiac State Estimation JOURNAL=Frontiers in Bioengineering and Biotechnology VOLUME=9 YEAR=2021 URL=https://www.frontiersin.org/journals/bioengineering-and-biotechnology/articles/10.3389/fbioe.2021.811396 DOI=10.3389/fbioe.2021.811396 ISSN=2296-4185