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Risk Behaviour Focus Group of the HBSC. Kokkevi, Anna and Nic Gabhainn, Saoirse and Spyropoulou, Joseph Simon Maria (2006) Early initiation of cannabis use: a cross-national European perspective. Journal of Adolescent Health, 39, pp. 712-719. https://doi.org/10.1016/j.jadohealth.2006.05.009.