Mohammed, N., Ashafa, A. M., and Aminu, M. “Seroprevalence of Hepatitis B Virus E Antigen Among Blood Donors in Kaduna State, Nigeria”. International Journal of Science for Global Sustainability, vol. 6, no. 3, Oct. 2020, p. 5, https://www.fugus-ijsgs.com.ng/index.php/ijsgs/article/view/90.