Amrollah Sharifi (2020) “Vitamin D decreases CD40L gene expression in ulcerative colitis patients: A randomized, double-blinded, placebo-controlled trial”, Turkish Journal of Gastroenterology, 31(2), pp. 99–104. Available at: https://tjg.avesjournals.com/index.php/tjg/article/view/3850 (Accessed: 27 July 2025).