title: Active surveillance for vaccine adverse effects.
authors.forename: R T
authors.initials: RT
authors.lastname: Chen
mesh_terms: D002648:Child; D002675:Child, Preschool; D015331:Cohort Studies; D006801:Humans; D007223:Infant; D007256:Information Systems; D008498:Medical Record Linkage; D016347:Medical Records Systems, Computerized; D011159:Population Surveillance; D014612:Vaccines / Q000009:adverse effects*
chemical_list: D014612:Vaccines