AUTHOR=Avrameas Stratis , Alexopoulos Haris , Moutsopoulos Harry M. TITLE=Natural Autoantibodies: An Undersugn Hero of the Immune System and Autoimmune Disorders—A Point of View JOURNAL=Frontiers in Immunology VOLUME=9 YEAR=2018 URL=https://www.frontiersin.org/journals/immunology/articles/10.3389/fimmu.2018.01320 DOI=10.3389/fimmu.2018.01320 ISSN=1664-3224