title: [Naturalistic studies to evaluate the effectiveness of medicines after being put on the market: why, when and how?].
authors.affiliation: Departamento de Economía de la Salud, Pharmacia & Upjohn, S.A., Madrid.
authors.forename: J
authors.initials: J
authors.lastname: Soto
authors.forename: J A
authors.initials: JA
authors.lastname: Sacristán
authors.forename: I
authors.initials: I
authors.lastname: Galende
mesh_terms: D002986:Clinical Trials as Topic; D004345:Drug Industry; D004363:Drug Utilization; D007880:Legislation, Drug