AUTHOR=Stein Christoph TITLE=Targeting pain and inflammation by peripherally acting opioids JOURNAL=Frontiers in Pharmacology VOLUME=4 YEAR=2013 URL=https://www.frontiersin.org/journals/pharmacology/articles/10.3389/fphar.2013.00123 DOI=10.3389/fphar.2013.00123 ISSN=1663-9812