Variations in Cannabis Use Level and Correlates in Opiate-Users on Methadone Maintenance Treatment: A French Prospective Study. Mayet, A.; Lions, C.; Roux, P.; Mora, M.; Maradan, G.; Morel, A.; Michel, L.; Marimoutou, C.; Carrieri, M. P.. J Subst Abuse Treat. 2015; 100-5: p.100-5. doi:10.1016/j.jsat.2015.06.015Article