Buchari UB, Muhar AM, Asrul A. The Differences in CEA Levels According to Histopathology Degree of Adenocarcinoma Rectum at Haji Adam Malik Medan Central General Hospital. ijmsci [Internet]. 2018 May 30 [cited 2024 Apr. 27];5(5):3816-8. Available from: http://valleyinternational.net/index.php/ijmsci/article/view/1236