1.chottker B, Adamu MA, Weck MN, Brenner H. Helicobacter pylori infection is strongly associated with gastric and duodenal ulcers in a large rospective study. Clin Gastroenterol Hepatol.2012;10(5):487–93 e1.
2. Tsang TK, Shrestha MP. Helicobacter Pylori Infection in Peptic Ulcer Disease. In: Jianyuan C editor. Pept Ulcer Dis.; 2011. p. 39.
3. Zali MR. Facing resistance of H. pylori infection. Gastroenterol Hepatol bed bench. 2010;4(1):3–11.
4. Khalifa MM, Sharaf RR, Aziz RK. Helicobacter pylori: a poor man's gut pathogen? Gut Pathog. 2010;2(1):2.
5. Kim JJ, Kim N, Lee BH, Kang JM, Seo P, Lim MK, et al. [Risk factors for development and recurrence of peptic ulcer disease]. Korean J Gastroenterol. 2010;56(4):220–8.
6. Venerito M, Malfertheiner P. Helicobacter.Hoboken, New Jersey:Blackwell Publishing Ltd; 2010.
7. Barazandeh F, Yazdanbod A, Pourfarzi F, Ghajarieh Sepanlou S, Derakhshan MH, Malekzadeh R. Epidemiology of Peptic Ulcer Disease: Endoscopic Results of a Systematic Investigation in Iran.MEJDD. 2012;4(2):90–6.
8. Lieberman D, Fennerty MB, Morris CD, Holub J, Eisen G, Sonnenberg A. Endoscopic evaluation of patients with dyspepsia: results from the national endoscopic data repository. Gastroenterology.2004;127(4):1067–75.
9. Lin KJ, Garcia Rodriguez LA, Hernandez-Diaz S. Systematic review of peptic ulcer disease incidence rates: do studies without validation provide reliable estimates? Pharmacoepidemiol Drug Saf.2011;20(7):718–28.
10. Fakhrieh S, Ehsani Ardakani MJ, Mohaghegh Shalmani H. Endoscopic evaluation of patients with dyspepsia: results from the large endoscopic data. Gastroenterol Hepatol bed bench.2009;1(1):25–31.
11. Kalantari H, Nourian M. Prevalance of Peptic Ulcer Versus Non Ulcer Dyspepsia in Patients which were admitted for Endoscopy. J Isfahan Med School. 2011;28:1304–8.
12. Li Z, Zou D, Ma X, Chen J, Shi X, Gong Y, et al. Epidemiology of peptic ulcer disease: endoscopic results of the systematic investigation of gastrointestinal disease in China. Am J Gastroenterol. 2010;105(12):2570–7.
13. Barkun A, Leontiadis G. Systematic review of the symptom burden, quality of life impairment and costs associated with peptic ulcer disease. Am J Med. 2010;123(4):358–66 e2.