Siregar, Gontar Alamsyah, and Sri Ningsih Lubis. 2017. “Comparison of Alpha-Fetoprotein Level in Varying Severity Degree of Hepatocellular Carcinoma Assesed With the Barcelona Clinic of Liver Cancer During 2015-2016 in Haji Adam Malik General Hospital Medan”. The Indonesian Journal of Gastroenterology, Hepatology, and Digestive Endoscopy 18 (1):20-24. https://doi.org/10.24871/181201720-24.