Idris, Israel O., Okiki O. Badejo, Victor Ochagu, Sheriff A. Lamidi, and Nataliia Gavkalova. “A Health Benefit and Cost-Effectiveness Analysis of Pneumococcal Conjugate Vaccination Program in Nigeria”. International Journal Of Community Medicine And Public Health 7, no. 2 (January 28, 2020): 463–474. Accessed October 25, 2025. https://www.ijcmph.com/index.php/ijcmph/article/view/4561.