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Madkour, Aubrey Spriggs and de Looze, Margaretha and Ma, Ping and Halpern, Carolyn Tucker and Farhat, Tilda and Ter Bogt, Tom F M and Ehlinger, Virginie and Nic Gabhainn, Saoirse and Currie, Candace and Godeau, Emmanuelle (2014) Macro-level age norms for the timing of sexual initiation and adolescents' early sexual initiation in 17 European countries. Journal of Adolescent Health , 55 , (1) , pp. 114-121.