Organisation of field trials of vaccines in England with special reference to measles vaccine.
D001500:BCG Vaccine / Q000627:therapeutic use*; D002675:Child, Preschool; D004739:England; D006801:Humans; D007223:Infant; D008458:Measles Vaccine / Q000627:therapeutic use*; D011446:Prospective Studies
D001500:BCG Vaccine; D008458:Measles Vaccine