ONUORAH, W. A. Comparative Effectiveness of NHIA Versus Out-of-Pocket Payment Models in Promoting Preventive Healthcare Utilisation in Nigeria. British Journal of Healthcare and Medical Research, [S. l.], v. 12, n. 05, p. 27–34, 2025. DOI: 10.14738/bjhr.1205.19300. Disponível em: https://journals.scholarpublishing.org/index.php/BJHR/article/view/19300. Acesso em: 14 mar. 2026.