1. Faculty of Medicine, Al-Azhar University, Assiut, Egypt
2. Faculty of Medicine, Menoufia University, Menoufia, Egypt
3. Faculty of Medicine, Al-Azhar University, Cairo, Egypt
4. Faculty of Medicine, Assiut University, Assiut, Egypt
5. Faculty of Medicine, Hashemite University, Zarqa, Jordan
6. Faculty of Medicine, Alexandria University, Alexandria, Egypt
7. Faculty of Medicine, Fayoum University, Fayoum, Egypt
8. Faculty of Medicine, Tanta University, Tanta, Egypt
9. Faculty of Medicine, Fajr College for Science and Technology, Khartoum, Sudan
10. Kateb University, Medical Research Center, Kateb University, Kabul.