Chisthi, M. M., Kuttanchettiyar, K. G., & Kollengode, V. V. "Cytokeratin Fragment 21.1 is a Useful Tumor Marker in Colonic Adenocarcinoma: A Cross-sectional Study", Iranian Journal of Colorectal Research, 10, 4, 2022, 143–149. doi: 10.30476/acrr.2022.97044.1157