1. Impact of vaccines universally recommended for children—United States, 1990-1998;Centers for Disease Control and Prevention;MMWR Morbid Mortal Wkly Rep,1999
2. Ten great public health achievements—United States, 1900-1999;Centers for Disease Control and Prevention;MMWR Morbid Mortal Wkly Rep,1999
3. US immunization policy;Abramson;JAMA,2002
4. Recommended childhood immunization schedule, United States, 2002;Centers for Disease Control and Prevention;MMWR Morbid Mortal Wkly Rep,2002
5. Recommended childhood immunization schedule–United States, 2002;American Academy of Pediatrics, Committee on Infectious Diseases;Pediatrics,2002