1. Eusebi LH, Zagari RM, Bazzoli F. Epidemiology of Helicobacter pylori infection. Helicobacter 2014;19 Suppl 1:1–5.
2. Zabala Torrres B, Lucero Y, Lagomarcino AJ, Orellana-Manzano A, George S, Torres JP, et al. Review: prevalence and dynamics of Helicobacter pylori infection during childhood. Helicobacter 2017;22.
4. Rhee KH, Youn HS, Baik SC, Lee WK, Cho MJ, Choi HJ, et al. Prevalence of Helicobacter pylori infection in Korea. J Korean Soc Microbiol 1990;25:475–90.
5. O'Ryan ML, Rabello M, Cortés H, Lucero Y, Peña A, Torres JP. Dynamics of Helicobacter pylori detection in stools during the first 5 years of life in Chile, a rapidly developing country. Pediatr Infect Dis J 2013;32:99–103.
9. Lee SY, Ko JS, Seo JK. Changes in the prevalence of biopsy-proven Helicobacter pylori infection in Korean children with functional recurrent abdominal pain over the last 18 years. Korean J Pediatr Gastroenterol Nutr 2009;12:150–5.
13. Seo JH, Park JS, Yeom JS, Lim JY, Park CH, Woo HO, et al. Correlation between positive rate and number of biopsy samples on urease test in childhood Helicobacter pylori infection. J Korean Med Sci 2014;29:106–9.
15. Urita Y, Watanabe T, Kawagoe N, Takemoto I, Tanaka H, Kijima S, et al. Role of infected grandmothers in transmission of Helicobacter pylori to children in a Japanese rural town. J Paediatr Child Health 2013;49:394–8.
17. den Hollander WJ, Holster IL, van Gilst B, van Vuuren AJ, Jaddoe VW, Hofman A, et al. Intergenerational reduction in Helicobacter pylori prevalence is similar between different ethnic groups living in a Western city. Gut 2015;64:1200–8.
18. Patterson T, Straten E, Jimenez S. The prevalence of Helicobacter pylori antibody in different age groups in Central Texas. Clin Lab Sci 2012;25:102–6.
21. Ghasemi-Kebria F, Ghaemi E, Azadfar S, Roshandel G. Epidemiology of Helicobacter pylori infection among Iranian children. Arab J Gastroenterol 2013;14:169–72.
22. Senbanjo IO, Oshikoya KA, Njokanma OF. Helicobacter pylori associated with breastfeeding, nutritional status and recurrent abdominal pain in healthy Nigerian children. J Infect Dev Ctries 2014;8:448–53.
23. Oleastro M, Pelerito A, Nogueira P, Benoliel J, Santos A, Cabral J, et al. Prevalence and incidence of Helicobacter pylori Infection in a healthy pediatric population in the Lisbon area. Helicobacter 2011;16:363–72.
24. Serrano CA, Talesnik E, Peña A, Rollán A, Duarte I, Torres J, et al. Inverse correlation between allergy markers and Helicobacter pylori infection in children is associated with elevated levels of TGF-β. Eur J Gastroenterol Hepatol 2011;23:656–63.
25. Parzecka M, Szaflarska-Popławska A, Gasiorowska J, Gorzkiewicz M, Grzybowski T. The prevalence of dupA (duodenal ulcer-promoting gene) of Helicobacter pylori in children and adolescents: own observation. Pol Merkur Lekarski 2013;34:277–80.
26. Gijsbers CF, Benninga M, Büller H. Clinical and laboratory findings in 220 children with recurrent abdominal pain. Acta Paediatr 2011;100:1028–32.
27. Elitsur Y, Alrazzak BA, Preston D, Demetieva Y. Does Helicobacter pylori protect against eosinophilic esophagitis in children? Helicobacter 2014;19:367–71.
28. Youn HS, Baik SC, Cho YK, Woo HO, Ahn YO, Kim K, et al. Comparison of Helicobacter pylori infection between Fukuoka, Japan and Chinju, Korea. Helicobacter 1998;3:9–14.
29. Okuda M, Osaki T, Lin Y, Yonezawa H, Maekawa K, Kamiya S, et al. Low prevalence and incidence of Helicobacter pylori infection in children: a population-based study in Japan. Helicobacter 2015;20:133–8.
30. Den Hollander WJ, Holster IL, den Hoed CM, van Deurzen F, van Vuuren AJ, Jaddoe VW, et al. Ethnicity is a strong predictor for Helicobacter pylori infection in young women in a multi-ethnic European city. J Gastroenterol Hepatol 2013;28:1705–11.
33. Cho MJ, Lee WK, Jeon YS, Kim KH, Kim SH, Baik SC, et al. Intrafamilial transmission of Helicobacter pylori detected by random amplified polymorphic DNA fingerprinting. Mol Cells 1995;5:508–13.
34. Benajah DA, Lahbabi M, Alaoui S, El Rhazi K, El Abkari M, Nejjari C, et al. Prevalence of Helicobacter pylori and its recurrence after successful eradication in a developing nation (Morocco). Clin Res Hepatol Gastroenterol 2013;37:519–26.
36. Kim MS, Kim N, Kim SE, Jo HJ, Shin CM, Lee SH, et al. Long-term follow-up Helicobacter pylori reinfection rate and its associated factors in Korea. Helicobacter 2013;18:135–42.
37. Yan TL, Hu QD, Zhang Q, Li YM, Liang TB. National rates of Helicobacter pylori recurrence are significantly and inversely correlated with human development index. Aliment Pharmacol Ther 2013;37:963–8.