T. Almammory, R. et al. 2015. Evaluation of Cryoglobulin Rheumatoid Factors concentration and Total IgG and IgA Levels Among Rheumatoid Arthritis Patients. Al-Kufa University Journal for Biology. 7, 1 (Apr. 2015), 48–54. DOI:https://doi.org/10.36320/ajb/v7.i1.8096.