Mehmet S. ÜLGEN (2019) “Effects of upper gastrointestinal endoscopy on the cardiovascular system of asymptomatic middle-aged and elderly patients without heart disease”, Turkish Journal of Gastroenterology, 12(3), pp. 214–217. Available at: https://turkjgastroenterol.avesjournals.com/index.php/tjg/article/view/1742 (Accessed: 12 July 2025).