AUTHOR=Ehara Hiroshi TITLE=Detailed Analysis of Immune Tolerance Mechanisms to SARS-CoV-2 in Children Is Needed JOURNAL=Frontiers in Pediatrics VOLUME=9 YEAR=2021 URL=https://www.frontiersin.org/journals/pediatrics/articles/10.3389/fped.2021.652838 DOI=10.3389/fped.2021.652838 ISSN=2296-2360