2Vilaichone RK, Mahachai V, Graham DY. Helicobacter pylori diagnosis and management[J]. Gastroenterol Clin North Am,2006,35(2) :229-247.
3Linz B, Balloux F, Moodley Y, et al. An African origin for the intimate association between humans and helicobacter pylori[J]. Nature, 2007,445(7130) : 915-918.
4Malaty HM. Epidemiology of Helicobacter pylori infec- tion[J]. Best Pract Res Clin Gastroenterol,2007,21 (2): 205-214.