From the Centers for Disease Control and Prevention. Vaccination coverage of 2-year-old children--United States, 1991-1992.
D002675:Child, Preschool; D015721:Diphtheria-Tetanus-Pertussis Vaccine / Q000008:administration & dosage; D006801:Humans; D008458:Measles Vaccine / Q000008:administration & dosage; D011054:Poliovirus Vaccine, Inactivated / Q000008:administration & dosage; D012959:Socioeconomic Factors; D014481:United States / Q000453:epidemiology; D014611:Vaccination / Q000706:statistics & numerical data* / Q000639:trends*
D015721:Diphtheria-Tetanus-Pertussis Vaccine; D008458:Measles Vaccine; D011054:Poliovirus Vaccine, Inactivated