Al-Ubaidi, A., M. Marrof Al-Ani, and K. Al-Bidri. “Comparism Between Anti-RA33, Anti-CCP Antibodies and Rheumatoid Factor in the Diagnosis of Rheumatoid Arthritis in Iraqi Patients”. Journal of the Faculty of Medicine Baghdad, Vol. 55, no. 1, Apr. 2013, pp. 64-67, doi:10.32007/jfacmedbagdad.551672.