1. Department of Hematology, Sultan Qaboos University Hospital, Muscat, Oman;
2. Department of Hematology, College of Medicine and Health Sciences, Sultan Qaboos University, Muscat, Oman;
3. Department of Medicine, Sohar Hospital, Ministry of Health, Muscat, Oman;
4. Department of Child Health, College of Medicine and Health Sciences, Sultan Qaboos University, Muscat, Oman