Nesterova, O.; Krasilnikova, V. .; Margaryan, E.; Lazareva, Y.; Nemtyreva, L. Treatment of Chronic Generalized Periodontitis in Patients With Underlying Hypovitaminosis D: Randomized Comparative Clinical Trial. J Appl Oral Sci 2023, 30, e20220335. https://doi.org/10.1590/1678-7757-2022-0335 .