AUTHOR=Simon David , Watad Abdulla , Rodrigues-Manica Santiago , Perricone Carlo TITLE=Editorial: Early Origins of Psoriatic Arthritis JOURNAL=Frontiers in Medicine VOLUME=8 YEAR=2021 URL=https://www.frontiersin.org/journals/medicine/articles/10.3389/fmed.2021.794229 DOI=10.3389/fmed.2021.794229 ISSN=2296-858X