Okafor A, Korie F, Ukegbu A, Ibe B. Prevalence and reasons for missed opportunities for vaccination in a Nigerian hospital. Nig. J. Paed. [Internet]. 2021 Aug. 10 [cited 2026 Nov. 6];46(4):195 -. Available from: https://www.ajol.info/index.php/njp/article/view/212284