Kolassery, S. “Correlation of HBsAg Quantitation by ELISA With Serum Hepatitis B Virus DNA Quantitative PCR in Chronic Hepatitis B Patients”. International Journal of Research in Medical Sciences, vol. 5, no. 6, May 2017, pp. 2422-5, doi:10.18203/2320-6012.ijrms20172126.