Duha Sadiq Abbas, Thanaa Rasheed Abdulrahman, Sajed Ali Hussain, “Detection of Helicobacter Pylori in Saliva and Oral Swab Versus Biopsy Samples Using Urease Test, Culture, PCR Technique”, Pakistan Journal of Medical & Health Sciences, vol. 16, no. 06, p. 368, Jul. 2022.