Inclusion Criteria per high schools:  High schools located in deprived areas. Deprived areas will be selected according to what is considered an area with a low socioeconomic level according to each country. Informed consent must be signed by the responsible of each high-school.  Exclusion Criteria per high schools:  The non-completion of one of the inclusion criteria.  Inclusion Criteria per participants:  Adolescents aged 13- to 15-years at baseline who attended one of the participating high schools, previously randomized. Informed consent must be signed by their parents/legal guardians and by each adolescent.  Exclusion Criteria per participants:  The non-completion of one of the inclusion criteria.