“Corelation Between Preoperative Serum CEA, CA19-9, and AFP Levels and Clinicopathologic Factors ”. Annals of Medical Research 15, no. 4 (May 25, 2021): 0233–0237. Accessed April 19, 2025. http://annalsmedres.org/index.php/aomr/article/view/3294.