Jafarzadeh, Abdollah, and Sayed Jalal Montazerifar. “PERSISTENCE OF ANTI-HBs ANTIBODY AND IMMUNOLOGICAL MEMORY IN CHILDREN VACCINATED WITH HEPATITIS B VACCINE AT BIRTH”. Journal of Ayub Medical College Abbottabad 18, no. 4 (December 1, 2006): 4–9. Accessed May 3, 2025. https://www.jamc.ayubmed.edu.pk/index.php/jamc/article/view/4261.