Affiliation: | 1.Rheumatology Department, Faculty of Medicine, Cairo University, Cairo, Egypt ;2.Rheumatology Department, Faculty of Medicine, Ain Shams University, Cairo, Egypt ;3.Rheumatology and Rehabilitation Department, Faculty of Medicine, Assuit University, Asyut, Egypt ;4.University of Alberta, Corbett Hall, 8205 114 Street, Edmonton, AB, T6G 2G4, Canada ;5.Clinical and Chemical Pathology Department (Immunology), Faculty of Medicine, Helwan University, Helwan, Egypt ; |