AUTHOR=Mainous Arch G. TITLE=Maintaining a Sufficient Primary Care Workforce: A Problem We Should Not Have JOURNAL=Frontiers in Medicine VOLUME=7 YEAR=2021 URL=https://www.frontiersin.org/journals/medicine/articles/10.3389/fmed.2020.638894 DOI=10.3389/fmed.2020.638894 ISSN=2296-858X