M. Kürşat TÜRKDOĞAN, et al. “Nitric Oxide Oxidation Products in the Serum of Patients With Gastric and Esophageal Cancer and Helicobacter Pylori”. Turkish Journal of Gastroenterology, vol. 10, no. 3, July 2019, pp. 193-6, https://tjg.avesjournals.com/index.php/tjg/article/view/1581.