Aji, G, Ida Ayu Ratih Wulansari Manuaba, Jeffrey A Ongkowijaya, Bambang Setiyohadi, and Sumariyono Sumariyono. “Correlation of Matrix Metalloproteinase-9 Level, Erythrocyte Sedimentation Rate, Rheumatoid Factor, and the Duration of Illness With Radiological Findings in Rheumatoid Arthritis Patients”. Indonesian Journal of Rheumatology 2, no. 1 (February 7, 2018). Accessed April 19, 2024. https://journalrheumatology.or.id/index.php/ijr/article/view/32.