Hypovitaminosis D in patients with oral leukoplakia: insights from a cross-sectional study - Maturana-Ramirez, Andrea; Aitken-Saavedra, Juan; Mora-Ferraro, Dante; Rojas-Zúñiga, Gabriel; Espinoza-Santander, Iris; Rojas-Alcayaga, Gonzalo; Ortega-Pinto, Ana; Reyes, Montserrat; Lazo, Diego; Caamanão, Egardo (Frontiers in Oncology, 2025)