AUTHOR=Heinrich Michael TITLE=Ethnopharmacology in the 21st century - grand challenges JOURNAL=Frontiers in Pharmacology VOLUME=1 YEAR=2010 URL=https://www.frontiersin.org/journals/pharmacology/articles/10.3389/fphar.2010.00008 DOI=10.3389/fphar.2010.00008 ISSN=1663-9812