Khalid, Sabeen, Muhammad Yousaf, Amir Rashid, and Saleem Khan. “Gene Expression of Interleukin-18 in Rheumatoid Arthritis Patients on Disease Modifying Anti-Rheumatic Drug Therapy”. Pakistan Journal of Medical Sciences 35, no. 3 (May 22, 2019). Accessed July 15, 2020. http://www.pjms.org.pk/index.php/pjms/article/view/1070.