Malignant transformation of oral leukoplakia: systematic review and meta‐analysis of the last 5 years Egileak: Aguirre-Urizar, J.M., Lafuente-Ibáñez de Mendoza, I., Warnakulasuriya, S. Urtea: 2021 Aldizkaria: Oral Diseases DOI: 10.1111/odi.13810