title: [Calculation of the amount of specimen necessary to estimate a proportion and a medium].
authors.affiliation: Unidad de Epidemiología y Salud Pública, Universidad de Navarra.
authors.forename: I
authors.initials: I
authors.lastname: Aguinaga Ontoso
authors.forename: M A
authors.initials: MA
authors.lastname: Martínez González
authors.forename: F
authors.initials: F
authors.lastname: Guillén Grima
mesh_terms: D003627:Data Interpretation, Statistical; D006801:Humans; D008433:Mathematics; D013048:Specimen Handling / Q000379:methods*