Role of 1,25(OH)2D On Cytochromes CYP27A1 and CYP27B1 in  Periodontitis: A Clinical Study, Thanoon, Asmaa Y., and Al-Mashhadane Faehaa Azher , Pharmacognosy Journal, December 2023, Volume 15, Issue 6, p.1112-1115, (2023)