6Fielding JE,et al.Immunization status of children of employees in a large corporation.Journal of American Medical Association,1994,271(7):525-30.
7Sutton GC,Mumps,measles and rubella vaccination:a pragmatic study.Public Health,1991,105:133-8.
8Berhane Y,et al.Are reminder stickers effective in reducing immunization dropout rates in Addis Ababa,Ethiopia?Journal of Tropical Medicine and Hygiene,1993,96:139-45.