Bakhshi, M. et al. 2026. Serum Level of 25-Hydroxy Vitamin D in an Iranian Subpopulation with Oral Squamous Cell Carcinoma with Different Histopathological Grades. Journal of Dental School. 44, 1 (Aug. 2026), e20. DOI:https://doi.org/10.22037/jds.v44i1.47175.