1. Anonymous. Ten great public health achievements—United States, 1900-1999;MMWR Morb Mortal Wkly Rep,1999
2. Historical comparisons of morbidity and mortality for vaccine-preventable diseases in the United States;Roush;JAMA,2007
3. Centers for Disease Control and Prevention. Recommended immunization schedule for persons aged 0 through 6 years United States 2011. Available at: http://www.cdc.gov/vaccines/recs/schedules/downloads/child/0-6yrs-schedule-pr.pdf. Accessed April 24, 2012.
4. Centers for Disease Control and Prevention. Recommended immunization schedule for persons aged 7 through 18 years United States 2011. Available at: http://www.cdc.gov/vaccines/recs/schedules/downloads/child/7-18yrs-schedule-pr.pdf. Accessed April 24, 2012.
5. Centers for Disease Control and Prevention. Recommended adult immunization schedule United States 2011. Available at: http://www.cdc.gov/vaccines/recs/schedules/downloads/adult/adult-schedule.pdf. Accessed April 24, 2012.