Dirican, Abuzer, Bulent Unal, Burak Isik, Fatih Sumer, Cuneyt Kayaalp, and Ilhan Aslan. 2021. “Corelation Between Preoperative Serum CEA, CA19-9, and AFP Levels and Clinicopathologic Factors”. Annals of Medical Research 15 (4):0233-37. http://www.annalsmedres.org/index.php/aomr/article/view/3294.