OKAFOR , A.; KORIE , F.; UKEGBU , A.; IBE , B. Prevalence and reasons for missed opportunities for vaccination in a Nigerian hospital. Nigerian Journal of Paediatrics, [S. l.], v. 46, n. 4, p. 195 –, 2021. DOI: 10.4314/njp.v46i4. Disponível em: https://www.ajol.info/index.php/njp/article/view/212284. Acesso em: 6 nov. 2026.