title: Use of ICD-9 diagnosis codes in epidemiologic surveys may significantly underestimate the incidence and impact of invasive pneumococcal disease locally.
authors.forename: Li Yang
authors.initials: LY
authors.lastname: Hsu
authors.forename: Tse Hsien
authors.initials: TH
authors.lastname: Koh
mesh_terms: D006306:Health Surveys; D006760:Hospitalization; D006801:Humans; D015994:Incidence; D038801:International Classification of Diseases; D011008:Pneumococcal Infections / Q000453:epidemiology*; D012846:Singapore / Q000453:epidemiology