1. Division of Thoracic Surgery, Department of Surgery, King Fahad Hospital of the University, Khobar, Saudi Arabia
2. College of Medicine, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
3. Department of Critical Care, King Fahad Hospital of the University, College of Medicine, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
4. Faculty of Medicine, Menoufia University, Shibin Al Kawm, Egypt