Effendi, R. et al. 2008. Profile of Colorectal Cancer Patients in Endoscopic Unit at Dr. Pirngadi Hospital - Medan. The Indonesian Journal of Gastroenterology, Hepatology, and Digestive Endoscopy. 9, 3 (Jan. 2008), 78–81. DOI:https://doi.org/10.24871/93200878-81.