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;

Barcelona Salut als Barris: Twelve years¿ experience of tackling social health inequalities through community-based interventions Ferran Daban; M. Isabel Pasarín; Carme Borrell; Lucía Artazcoz; Anna Pérez; Ana Fernández; Victoria Porthé; Elia Díez;