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Barcelone (2) School children (2) Health (2) Factores (2) Salud (2) Estudio (2) Escolares (2) Evolution (Biology) (1) Teenagers (1) Trust (1) Toleration (1) Tobacco (1) Surveys (1) Students (1) Spring (1) Social status (1) Sex (Biology) (1) Physics (1) Obesity in children (1) Obesity (1) Nutrition--Psychological aspects (1) Neighborhoods (1) Longitudinal method (1) Logistics (1) Intention (1) Girls (1) Friendship (1) Families (1) Education, Secondary (1) Determinants (1)