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2. Drug Use, Impaired Driving and Traffic Accidents. INSIGHTS 8;European Monitoring Centre for Drugs and Drug Addiction (EMCDDA),2008
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4. Drug use among Quebec drivers: the 1999 roadside survey;Dussault,2000
5. Medicinal and illegal drugs among Danish car drivers;Behrensdorff;Accid. Anal. Prev.,2003