title: [Research design: a brief methodologic review].
authors.forename: Maite
authors.initials: M
authors.lastname: Vallejo
mesh_terms: D016022:Case-Control Studies; D015331:Cohort Studies; D003430:Cross-Sectional Studies; D006801:Humans; D012107:Research Design
vernacular_title: El diseño de investigación: una breve revisión metodológica.