1. Department of Internal Medicine, Shahid Modarres Hospital, Shahid Beheshti University of Medical Sciences
2. Critical Care and Quality Improvement Research Center, Department of General Surgery, Shahid Modarres Hospital, Shahid Beheshti University of Medical Sciences
3. Clinical Research and Development Center, Department of Radiology, Shahid Modarres Hospital, Shahid Beheshti University of Medical Sciences
4. Clinical Instructor of Surgery, Northeastern Ohio University (NEOMED)
5. Vascular and Laparoscopic Surgery, Clinical Research and Development Center, Shahid Modarres Hospital, Department of Surgery, Shahid Beheshti University of Medical Sciences