Atilgan Tolga Akcam (2019) “18F-FDG activitiy PET/CT and CA-19.9 levels for the prediction of histopathological features and localization of peri- ampullary tumors”, Turkish Journal of Gastroenterology, 26(2), pp. 170–175. Available at: https://tjg.avesjournals.com/index.php/tjg/article/view/3122 (Accessed: 18 August 2025).