The importance of carbonhydrate antigens (CA 19-9, CA 125), carcinoembriyonic antigen (CEA) and alkaline phosphatase (AP) in patients with gastric and colorectal cancer - OKÇU, Nihat; UYANIK, Bekir SAMİ and AKARSU, Ersin and BAKAN, Ebubekir and TONBUL, H. Zeki (Turkish Journal of Gastroenterology, 1995)