Tarigan, Elias, Leonardo Basa Dairy, Juwita Sembiring, Mabel Sihombing, Gontar Alamsyah Siregar, and Lukman Hakim Zain. 2013. “S-Index and APRI Score to Predict Liver Fibrosis Chronic in Hepatitis B and C Patients”. The Indonesian Journal of Gastroenterology, Hepatology, and Digestive Endoscopy 14 (2):64-68. https://doi.org/10.24871/142201364-68.