AUTHOR=Guilpain Philippe , Noël Danièle , Avouac Jérôme TITLE=Editorial: Key Players in Systemic Sclerosis: The Immune System and Beyond JOURNAL=Frontiers in Immunology VOLUME=12 YEAR=2021 URL=https://www.frontiersin.org/journals/immunology/articles/10.3389/fimmu.2021.770419 DOI=10.3389/fimmu.2021.770419 ISSN=1664-3224