“Relationship Between Serum Vitamin A Levels and Maternal Education and Social Status Among Undernourished Children in Zaria”, Niger J Paediatr, vol. 51, no. 1, pp. 1–9, Jul. 2024, Accessed: Jun. 17, 2026. [Online]. Available: https://www.njpaediatrics.com/index.php/njp/article/view/1166