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;

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;

Las asfixias accidentales en México: un problema de salud pública oculto Ricardo Pérez-Núñez; Juan Daniel Vera-López;