1. Department of Rheumatology Sudan Medical Specialization Board Khartoum Sudan
2. Department of Internal Medicine Wayne State University Detroit Michigan USA
3. Department of Internal Medicine and Rheumatology Omdurman Military Hospital Khartoum Sudan
4. Department of Internal Medicine Detroit Medical Centre Detroit Michigan USA
5. Department of Clinical Medicine Medical and Cancer Research Institute Nyala Sudan
6. Faculty of Medicine Alfashir University Alfashir Sudan