1. Department of Medical Microbiology, Faculty of Medical Laboratory Sciences, Sudan Medical and Scientific Research Institute, University of Medical Sciences and Technology, Khartoum, Sudan
2. Department of Obstetrics and Gynecology, Faculty of Medicine, Sudan Medical and Scientific Research Institute, University of Medical Sciences and Technology, Khartoum, Sudan
3. Department of Pathology, Faculty of Medicine, Sudan Medical and Scientific Research Institute, University of Medical Sciences and Technology, Khartoum, Sudan
4. Department of Medicine, Faculty of Medicine, Sudan Medical and Scientific Research Institute, University of Medical Sciences and Technology, Khartoum, Sudan