GÜZELBULUT, Fatih, et al. “AST-Platelet Ratio Index in the Prediction of Significant Fibrosis and Cirrhosis in Patients With Chronic Hepatitis B”. Turkish Journal of Gastroenterology, vol. 23, no. 4, Jan. 2012, pp. 353-8, doi:10.4318/tjg.2012.0348.