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Urban and social determinants of alcohol and tobacco consumption among adolescents in Madrid Maitane Berasaluce; Irene Martín-Turrero; Roberto Valiente; Lucía Martínez-Manrique; María Sandín-Vázquez; Xisca Sureda;

Fidelity of implementation of Reptes, an alcohol and cannabis selective prevention program for youngsters Noelia Vázquez; Xavier Continente; Montse Bartroli; Olga Juárez; Laura Muñoz; Francesca Sánchez-Martínez; Anna Pérez; Carles Ariza;