1. Department of Allied Health Sciences, College of Medicine and Health Sciences, Sultan Qaboos University, Muscat, Oman
2. Department of Haematology, College of Medicine and Health Sciences, Sultan Qaboos University Hospital, Muscat, Oman
3. Department of Child Health, College of Medicine and Health Sciences, Sultan Qaboos University Hospital, Muscat, Oman
4. Faculty of Medicine, Pediatric Department, Alexandria University, Alexandria Governorate, Egypt