Batubara, I. F., and S. Sonia. “The Effect of Vitamin D in Reducing C-Reactive Protein Levels in Ulcerative Colitis: Evidence-Based Case Report: Evidence-Based Case Report”. Cermin Dunia Kedokteran, vol. 53, no. 06, June 2026, pp. 388-94, doi:10.55175/cdk.v53i06.2033.