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Godeau, Emmanuelle and Vignes, Celine and ter Bogt, Tom and Nic Gabhainn, Saoirse and Navarro, Felix (2006) Cannabis use by 15-year-old schoolchildren. Data from the HBSC/WHO international survey in 32 western countries. Alcoologie et Addictologie , 28 , (2) , pp. 135-142.