AUTHOR=Jabbour Richard J. , Latib Azeem , Colombo Antonio , Panoulas Vasileios TITLE=Editorial: Transcatheter Aortic Valve Implantation—Current Challenges and Future Directions JOURNAL=Frontiers in Cardiovascular Medicine VOLUME=8 YEAR=2021 URL=https://www.frontiersin.org/journals/cardiovascular-medicine/articles/10.3389/fcvm.2021.748376 DOI=10.3389/fcvm.2021.748376 ISSN=2297-055X