1. Faculty of Medicine, University of Aleppo, Aleppo 15310, Syria
2. Department of Dermatology & Venereology, Aleppo University Hospital, Aleppo 15310, Syria
3. Department of Thoracic Surgery, Al-Razi Hospital, Aleppo 15310, Syria
4. Department of General Surgery, St Louis Hospital, Aleppo 15310, Syria
5. Department of Thoracic Surgery, St Louis Hospital, Aleppo 15310, Syria