AUTHOR=Courtin Emilie , Vineis Paolo TITLE=COVID-19 as a Syndemic JOURNAL=Frontiers in Public Health VOLUME=9 YEAR=2021 URL=https://www.frontiersin.org/journals/public-health/articles/10.3389/fpubh.2021.763830 DOI=10.3389/fpubh.2021.763830 ISSN=2296-2565