Desalegn, Z., and S. Gebre Selassie. “Prevalence of Hepatitis B Surface Antigen (HBsAg) Among Health Professionals in Public Hospitals in Addis Ababa, Ethiopia”. The Ethiopian Journal of Health Development, vol. 27, no. 1, Sept. 2016, https://ejhd.org/index.php/ejhd/article/view/314.