A. M. Banafa, W. H. Edrees, G. H. Al-Falahi, and W. A. Al-Shehari, “Prevalence of Hepatitis B Surface Antigen among Orphans Children Living in Orphanage in Sana’a City, Yemen”, PSM Microbiol, vol. 7, no. 1, pp. 19–26, Mar. 2022.