title: Evaluating outcomes in normal populations: does it have to be nonexperimental?
authors.forename: C M
authors.initials: CM
authors.lastname: Kozma
mesh_terms: D001249:Asthma / Q000628:therapy*; D019468:Disease Management; D006302:Health Services Research; D006801:Humans; D009864:Ontario; D017063:Outcome Assessment, Health Care; D010353:Patient Education as Topic; D012106:Research