Köksal, İftihar, et al. “Diagnostic Value of Combined Serum Biomarkers for the Evaluation of Liver Fibrosis in Chronic Hepatitis C Infection: A Multicenter, Noninterventional, Observational Study”. Turkish Journal of Gastroenterology, vol. 29, no. 4, Jan. 2018, pp. 464-72, doi:10.5152/tjg.2018.16597.