AUTHOR=Gramignoli Roberto , Sallustio Fabio , Widera Darius , Raschzok Nathanael TITLE=Editorial: Tissue Repair and Regenerative Mechanisms by Stem/Progenitor Cells and Their Secretome JOURNAL=Frontiers in Medicine VOLUME=6 YEAR=2019 URL=https://www.frontiersin.org/journals/medicine/articles/10.3389/fmed.2019.00011 DOI=10.3389/fmed.2019.00011 ISSN=2296-858X