Sadeghi, Mostafa, Zarabadipour, Mahdieh, Azmodeh, Faezeh, Mirzadeh, Monirsadat, AND Golezari, Ali. " Association of serum level of 25-hydroxy vitamin D with Oral Lichen Planus. A case-control study." Journal of Oral Research [Online], Volume 9 Number 5 (5 January 2021)