Akcam, Atilgan Tolga, Abdullah Ülkü, Ahmet Rencuzoğulları, Cem Kaan Parsak, Zeynep Yapar, Figen Doran, Haluk Demiryürek, and Alexis Kofi Okoh. 2015. “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):170-75. https://doi.org/10.5152/tjg.2015.7870.