Tolga Yakar (2019) “The relationship of recurrent aphthous stomatitis and Helicobacter pylori, cytokine gene polymorphism and cobalamin”, Turkish Journal of Gastroenterology, 26(4), pp. 304–308. Available at: https://turkjgastroenterol.avesjournals.com/index.php/tjg/article/view/3158 (Accessed: 5 July 2025).