1. From the Department of Medicine, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
2. From the Department of Pulmonary Medicine, National Research Centre, Cairo, Egypt
3. From the Pulmonary Department, Faculty of Medicine, Ain Shams University, Cairo, Egypt
4. From the College of Medicine, King Saud University, Riyadh, Saudi Arabia
5. From the Department of Radiology, Johns Hopkins, Aramco Medical City, Saudi Arabia