زريق . ي. ., and وسوف . ر. . “Evaluation of Protective Response to Hepatitis B Vaccine in Children at Tishreen University Hospital”. Latakia University Journal -Medical Sciences Series, vol. 43, no. 6, Jan. 2022, pp. 423-30, https://journal.latakia-univ.edu.sy/index.php/hlthscnc/article/view/11567.