title: Under and over demand and the use of personal health services: the problem of differential accessibility.
mesh_terms: D002677:Chile; D006285:Health Planning; D006296:Health Services; D006801:Humans; D007348:Insurance, Health; D008962:Models, Theoretical; D012959:Socioeconomic Factors; D011795:Surveys and Questionnaires; D014600:Utilization Review