Bukbuk D, Bassi A, Mangoro Z. Sero-prevalence of hepatitis B surface antigen among primary school pupils in rural Hawal valley, Borno State, Nigeria. J. Com. Med. and PHC [Internet]. 2005 Dec. 9 [cited 2026 Jul. 30];17(1):20-3. Available from: https://www.ajol.info/index.php/jcmphc/article/view/32420