Jafarzadeh, A., & Montazerifar, S. J. (2006). PERSISTENCE OF ANTI-HBs ANTIBODY AND IMMUNOLOGICAL MEMORY IN CHILDREN VACCINATED WITH HEPATITIS B VACCINE AT BIRTH. Journal of Ayub Medical College Abbottabad, 18(4), 4–9. Retrieved from https://www.jamc.ayubmed.edu.pk/index.php/jamc/article/view/4261