Pattern of childhood pertussis in a tertiary hospital in Nigeria: a five year review (2007-2011) . NIGERIAN JOURNAL OF PAEDIATRICS, [S. l.], v. 42, n. 2, p. 83–87, 2024. Disponível em: https://www.njpaediatrics.com/index.php/njp/article/view/259.. Acesso em: 18 nov. 2024.