S. M. Sami, I. I. Salama, G. A. Abdel-Latif, L. A. El Etreby, A. I. Metwally, and N. F. Abd El haliem, “Hepatitis B Seroprotection and the Response to a Challenging Dose among Vaccinated Children in Red Sea Governorate”, Open Access Maced J Med Sci, vol. 4, no. 2, pp. 219–225, May 2016.