AUTHOR= Frontiers Editorial Office TITLE=Retraction: CuO and CeO2 Nanostructures Green Synthesized Using Olive Leaf Extract Inhibits the Growth of Highly Virulent Multidrug Resistant Bacteria JOURNAL=Frontiers in Pharmacology VOLUME=10 YEAR=2019 URL=https://www.frontiersin.org/journals/pharmacology/articles/10.3389/fphar.2019.00135 DOI=10.3389/fphar.2019.00135 ISSN=1663-9812