Barcelone (1) Madrid (1) Drugs of abuse (1) Labor (1) Young consumers (1) Weights and measures (1) Paper (1) Months (1) Methodology (1) Heroin (1) Health (1) Consumers (1) Communities (1) Cohort analysis (1) Cocaine (1) Cities and towns (1) Consumo juvenil (1) Meses (1) Salud (1) Españolas (1) Heroína (1) Estudio (1) Cocaína (1) Pesos y medidas (1) Papel (1) Ciudades (1) Comunidad (1) Drogas (1) Metodología (1) Trabajo (1)