Maslim, Y., S. Dewi, A. Oehadian, and R. G. Wachjudi. “The Effect of Vitamin D Supplementation on Disease Activity and Neutrophyl-Lymphocyte Count Ratio in Systemic Lupus Erythematosus Patients With Hypovitaminosis D : A Preliminary Study”. Indonesian Journal of Rheumatology, Vol. 5, no. 1, Feb. 2018, doi:10.37275/ijr.v5i1.48.