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[2] http://www.drugabuse.gov/related-topics/trends-statistics/monitoring-future/monitoring-future-survey-overview-findings-2014 (acedido a 20/05/15)

[3] http://www.drugabuse.gov/trends-statistics/monitoring-future/monitoring-future-study-trends-in-prevalence-various-drugs (acedido a 20/05/15)

[4] http://www.ncbi.nlm.nih.gov/pubmed/1346559 (acedido a 22/05/15) 

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