Leiva, A; Estela, A; Torrent, M; Calafat, A; Bennasar, M; Yañez, A.
Effectiveness of a complex intervention in reducing the prevalence of smoking among adolescents: study design of a cluster-randomized controlled trial
BMC Public Health 2014, 14:373
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Effectiveness of a complex intervention in reducing the prevalence of smoking among adolescents: study design of a cluster-randomized controlled trial