Centre (1) Prevention (1) Problem youth (1) Teenagers (1) Youth (1) Year (1) State, The (1) Silver (1) Scientists (1) School attendance (1) Risk (1) Psychotropic drugs (1) Proportion (1) Play (1) Perspective (1) Necessity (Philosophy) (1) Middle age (1) Juvenile delinquency (1) Goodwill (Commerce) (1) Girls (1) Gambling (1) Gamblers (1) Discussion (1) Criminals (1) Boys (1) Teenage girls (1) Research (1) Prizes, etc (1) Infancy (1) Necesidad (Filosofía) (1)