Rahman S, Al-Mahtab M, Sayedul Haque M, Sultana S, Al-Mamun A.
The Value of Serum CA19-9 Levels in predicting Extent of
Hepatic Fibrosis in Patients with Chronic Hepatitis B. 
Euroasian J Hepatogastroenterol
2015;
5
(1):16-18.