Meral AKDOĞAN, Erkan PARLAK, Burçak KAYHAN, Mevhibe BALK, Gül ERSAVAŞTF, and Burhan ŞAHİN, “Are serum and biliary carcinoembryonic antigen and carbohydrate antigen19-9 determinations reliable for differentiation between benign and malignant biliary disease?”, Turkish Journal of Gastroenterology, vol. 14, no. 3, pp. 181–184, Jul. 2019.