1. Impact of vaccines ….;MMWR,1999
2. Final 2005 Reports of Notifiable Diseases.;MMWR,2006
3. Recommended immunization schedules for children.;Pediatrics,2007
4. Safety of combination vaccines;Halsey;Pediatr Infect Dis J,2001
5. Missed opportunities for vaccination.;Ball;Arch Pediatr Adolesc Med,1996