Akil, Natsir, H Isbagio, and Sumariyono Sumariyono. 2018. “Correlation of Serum Level of Interleukin-6 and Disease Activity With Bone-Resorption Activity in Premenopausal Rheumatoid Arthritis Patients”. Indonesian Journal of Rheumatology 4 (1). https://doi.org/10.37275/ijr.v4i1.87.