AUTHOR=Lee Paul H. TITLE=Editorial: Adverse Health Consequences of Excessive Smartphone Usage JOURNAL=Frontiers in Public Health VOLUME=9 YEAR=2021 URL=https://www.frontiersin.org/journals/public-health/articles/10.3389/fpubh.2021.689968 DOI=10.3389/fpubh.2021.689968 ISSN=2296-2565