Tunruttanakul, Suppadech, and Jintana Wairangkool. 2018. “Prevalence of Helicobacter Pylori Infection in Patients With Perforated Peptic Ulcer in a Tertiary Hospital in Thailand: A Single Tertiary Hospital Study”. Siriraj Medical Journal 70 (2):139-44. https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/127509.