1. Daoud Research Group, Khartoum, Sudan
2. Department of Internal Medicine, University of Khartoum, Khartoum, Sudan
3. Intensive Care Unit, Jafar Ibn Auf Specialized Hospital for Children, Khartoum, Sudan
4. Department of Anatomy, St. George’s University, Grenada, West Indies
5. Department of Internal Medicine, King Abdulaziz Specialist Hospital, Ta’if, Saudi Arabia
6. Department of Obstetrics and Gynecology, Almoa’lem Medical City, Khartoum, Sudan