«Prevalence of Vitamin D Deficiency and Insufficiency Across Trimesters of Pregnancy in Maiduguri, Nigeria: A Cross-Sectional Study» (2021) African Journal of Biomedical Research, 24(1), p. 53–57. Disponible a: https://www.ojshostng.com/index.php/ajbr/article/view/1689 (Consulta: 5 abril 2026).