UMEOKONKWO, A.; EZEONU , T.; AGU, A.; UMEOKONKWO, C. Timeliness of vaccination among children attending immunization clinic at a tertiary hospital in South-East Nigeria. Nigerian Medical Journal, [S. l.], v. 62, n. 4, p. 153–161, 2022. DOI: 10.60787/nmj.v62i4.29. Disponível em: https://www.nigerianmedjournal.org/index.php/nmj/article/view/29. Acesso em: 23 apr. 2026.