Inci F, Karatas F. The relationship of preoperative and postoperative serum CEA and CA 19-9 levels with tumor localization, stage and overall survival in patients with colorectal cancer . annalsmedres [Internet]. 2021 May 25 [cited 2024 May 2];28(4):0726-32. Available from: http://www.annalsmedres.org/index.php/aomr/article/view/465