2. Rodewald LE, Szilagyi PG, Shiuh T, et al. Is under-immunization a marker for insufficient utilization of preventive and primary care? Arch Pediatr Adolesc Med 1995;4;149(4):393-7.
4. Kim YJ, Lee HS. Increasing incidence of hepatitis A in Korean adults. Intervirology 2010;53(1):10-4.
6. Yun SW, Lee WK, Cho SY, et al. The seroprevalence rate, vaccination rate and seroconversion rate of hepatitis A in central region of Korea. Korean J Gastroenterol 2011;3;57(3):166-72; [Article in Korean].
8. Luman ET, McCauley MM, Shefer A, et al. Maternal characteristics associated with vaccination of young children. Pediatrics 2003;5;111(5 Part 2):1215-8.
9. Santoli JM, Huet NJ, Smith PJ, et al. Insurance status and vaccination coverage among US preschool children. Pediatrics 2004;6;113(6 Suppl):1959-64.
10. Bobo JK, Gale JL, Thapa PB, et al. Risk factors for delayed immunization in a random sample of 1163 children from Oregon and Washington. Pediatrics 1993;2;91(2):308-14.
11. Steyer TE, Mainous AG 3rd, Geesey ME. The effect of race and residence on the receipt of childhood immunizations: 1993–2001. Vaccine 2005;2;23(12):1464-70.
12. Smith PJ, Santoli JM, Chu SY, et al. The association between having a medical home and vaccination coverage among children eligible for the vaccines for children program. Pediatrics 2005;7;116(1):130-9.
13. Korea Centers for Disease Control and Prevention. Epidemiology and management of vaccine-preventable diseases Osong: Korea Centers for Disease Control and Prevention; 2011.
14. Communicable disease prevention and control act Seoul: Korea Ministry of Health and Welfare; 2011.
15. Korea Centers for Disease Control and Prevention. Development of vaccination coverage estimation methods and evaluation indicators of National Immunization Program in Korea Seoul: Korea Centers for Disease Control and Prevention; 2005.
16. Zucs AP, Crispin A, Eckl E, et al. Risk factors for under-vaccination against measles in a large sample of preschool children from rural Bavaria. Infection 2004;6;32(3):127-33.
17. Kim EY, Lee MS. Related factors of age-appropriate immunization among urban-rural children aged 24–35 months in a 2005 population-based survey in Nonsan, Korea. Yonsei Med J 2011;1;52(1):104-12.
18. Cho HY, Kim CH, Go UY, et al. Immunization decision-making in the Republic of Korea: the structure and functioning of the Korea Advisory Committee on Immunization Practices. Vaccine 2010;4;28(Suppl. 1):A91-5.
19. Sohn YM, Rho HO, Park MS, et al. The changing epidemiology of hepatitis A in children and the consideration of active immunization in Korea. Yonsei Med J 2000;2;41(1):34-9.
20. Jeong SH. Current status and vaccine indication for hepatitis A virus infection in Korea. Korean J Gastroenterol 2008;6;51(6):331-7; [Article in Korean].
21. Song YB, Lee JH, Choi MS, et al. The age-specific seroprevalence of hepatitis A virus antibody in Korea. Korean J Hepatol 2007;13(1):27-33.
22. Fiore AE, Feinstone SM, Bell BP. Hepatitis A vaccines Philadelphia: Saunders Elsevier; 2008. pp 177-203.
23. Van Damme PA, Van Herck K, Banatvala JE. Do we need hepatitis A booster vaccinations? J Travel Med 2004;May-Jun;11(3):179-80.
24. Williams J, Bruden D, McMahon B. Response to two doses of hepatitis A vaccine administered an average of 27 months apart. Antiviral Ther 2000;13(5):24,
25. Landry P, Tremblay S, Darioli R, et al. Inactivated hepatitis A vaccine booster given >/=24 months after the primary dose. Vaccine 2000;19(4–5):399-402.
26. Iwarson S, Lindh M, Widerström L. Excellent booster response 4 to 8 years after a single primary dose of an inactivated hepatitis A vaccine. J Travel Med 2004;Mar-Apr;11(2):120-1.
27. Stokley S, Rodewald LE, Maes EF. The impact of record scattering on the measurement of immunization coverage. Pediatrics 2001;1;107(1):91-6.