1. Vascular Surgery Department, Al-Razi Hospital , Aleppo 963 , Syria
2. Faculty of Medicine, Aleppo University , Aleppo 963 , Syria
3. Public Health Department, Centre of Strategic Studies and Health Training , Damascus 963 , Syria
4. Vascular and Endovascular Surgery Department, Al-Assad University Hospital , Damascus 963 , Syria
5. Faculty of Medicine, Damascus University , Damascus 963 , Syria
6. Pathology Department, Al-Assad University Hospital , Damascus 963 , Syria
7. Oncology Department, Al-Amal Center , Damascus 963 , Syria
8. Oncology Department, Al-Bairuni University Hospital , Damascus 963 , Syria
9. General Surgery Department, Al-Assad University Hospital , Damascus 963 , Syria