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16. Hibell B, Andersson B, Bjarnason T, Ahlström, Balakireva O, Kokkevi A, Morgan M. The ES PAD Report 2003: Alcohol and other drug use among students in 35 European Countries [consultado 4 Ab 2013]. Disponível em: http://www.espad.org/Uploads/ESPAD_reports/2003/The_2003_ESPAD_report.pdf