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Vargas Barrantes, Élida and Araya Alpízar, C. 1. Influence of socio-demographic conditions in attitudes and behaviour in sexuality that express the youth of ninth year from a public school in the Canton Central Alajuela, Costa Rica. Población y Salud en Mesoamérica. 10, 1 (1). DOI:https://doi.org/10.15517/psm.v10i1.1203.