Pankongngam, C. “Increasing Detection Rate of Helicobacter Pylori Infection in Nonvariceal Upper Gastrointestinal Bleeding Patients by Adding Histology to the Rapid Urease Test: An Experience from Lampang Hospital”. Biomedical Sciences and Clinical Medicine, vol. 56, no. 4, Oct. 2017, pp. 187-93, https://he01.tci-thaijo.org/index.php/CMMJ-MedCMJ/article/view/106653.