title: Immunizations.
authors.affiliation: Boston University School of Medicine, Massachusetts.
authors.forename: J O
authors.initials: JO
authors.lastname: Klein
mesh_terms: D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D014481:United States; D014611:Vaccination / Q000331:legislation & jurisprudence