1. Cross-national differences in clinically significant cannabis problems: epidemiologic evidence from 'cannabis-only' smokers in the United States, Mexico, and Colombia Fiestas, Fabian; Radovanovic, Mirjana; Martins, Silvia S.; Medina-Mora, Maria E.; Posada-Villa, Jose; Anthony, James C. 2010 Articles EpidemiologyPublic health