1. Department of Chest Medicine and Critical Care Liaquat National Hospital and Medical College Karachi Pakistan
2. Department of Chest Medicine and Critical Care Dr. Ziauddin University Hospital Karachi Pakistan
3. Department of Thoracic Surgery Liaquat National Hospital and Medical College Karachi Pakistan
4. Department of Medicine Dr. Ziauddin University Hospital Karachi Pakistan
5. Department of Medicine Bangladesh Medical College Dhaka Bangladesh