1. Department of Rheumatology and Rehabilitation, Assiut University Hospitals, Assiut, Egypt;
2. Faculty of Medicine, University of Alberta, Edmonton, AB, Canada;
3. Department of Clinical Pathology, Aswan University Hospital, Aswan University, Aswan, Egypt;
4. Department of Radiology, Assiut University Hospitals, Assiut, Egypt;
5. Division of Rheumatology, University of British Columbia, Vancouver, BC, Canada