Lama H., M., F. Hussein, H. Sadek, and W. Abdelghany. “Serum Vitamin D Level in Healthy Individuals Versus Patients With Symptomatic and Asymptomatic Oral Lichen Planus: Vitamin D Level in OLP”. Cellular and Molecular Biology, vol. 68, no. 2, Feb. 2022, pp. 19-25, doi:10.14715/cmb/2022.68.2.3.