1. Department of Paediatrics, College of Medicine, Arabian Gulf University, Bahrain
2. Department of Medical laboratory sciences, College of Applied medical sciences, University of Bisha, Bisha, Saudi Arabia and Department of Histopathology and Cytology, Faculty of Medical Laboratory Sciences, University of Khartoum, Khartoum, Sudan
3. Department of Basic Medical Sciences (Microbiology Unit), College of Medicine, University of Bisha, Bisha, Saudi Arabia and Department of Medical Microbiology, Faculty of Medical Laboratory Sciences, University of Khartoum, Sudan
4. Department of Pediatrics, College of Medicine, University of Bisha, Bisha Saudi Arabia and Department of Pediatrics, faculty of medicine, University of Bahri, Sudan
5. Department of Basic medical sciences, college of Medicine, University of Bisha, Bisha, Saudi Arabia