AUTHOR= Frontiers Editorial Office TITLE=Expression of Concern: Discoidin Domain Receptors: Potential Actors and Targets in Cancer JOURNAL=Frontiers in Pharmacology VOLUME=7 YEAR=2016 URL=https://www.frontiersin.org/journals/pharmacology/articles/10.3389/fphar.2016.00228 DOI=10.3389/fphar.2016.00228 ISSN=1663-9812