Ahmet AYDIN, et al. “The Efficacy of Two-Week Therapy With Ranitidine Bismuth Citrate, Amoxicillin and Clarithromycin on Helicobacter Pylori Eradication in Clarithromycinresistant And- Sensitive Cases”. Turkish Journal of Gastroenterology, vol. 16, no. 4, July 2019, pp. 203-6, https://tjg.avesjournals.com/index.php/tjg/article/view/1994.