1. Committee of Research Ethics Deputy Minister of Research and Technology Ministry of Health Tehran Iran
2. General Surgery Department Shahid Modarres Hospital Shahid Beheshti University of Medical Sciences Tehran Iran
3. Critical Care Quality Improvement Research Center Shahid Modarres Hospital Shahid Beheshti University of Medical Sciences Tehran Iran
4. Department of Radiology Shahid Labbafinejad Hospital Shahid Beheshti University of Medical Sciences Tehran Iran
5. Pathology Department Shahid Modarres Hospital Shahid Beheshti University of Medical Sciences Tehran Iran