This was an analytical cross-sectional observational study whose protocol received the approval of the Clinical Research Ethics Committee of the Sant Joan de Reus University Hospital [14-09-18/9proj2]. Data collection was conducted in the primary schools Escola Joan Rebull (EJR) and InstitutEscola Pi del Burgar (IEPB) of Reus (Tarragona) during the months of October 2014 to March 2015.
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