A. Al-Ubaidi, 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”, JFacMedBagdad, vol. 55, no. 1, pp. 64-67, Apr. 2013.