BAUTISTA PÉREZ, F. Risk and protection factors associated with the consumption of alcohol, tobacco and marijuana consumption in seventh through ninth grade students in five schools in the city of San Salvador. Revista Científica Crea Ciencia, [S. l.], v. 11, n. 1-2, p. 67–81, 2017. DOI: 10.5377/creaciencia.v11i1-2.6042. Disponível em: https://camjol.info/index.php/CREACIENCIA/article/view/6042. Acesso em: 20 oct. 2024.