S. Javed and F. Hashmi, “Association between Serum Vitamin D3 Deficiency and Periodontitis: Evidence from a Pakistani Population”, Pak J Healthc Res, vol. 1, no. 1, pp. 4–6, Jun. 2024, Accessed: Oct. 07, 2026. [Online]. Available: https://pjhr.com.pk/index.php/journal/article/view/18