1. General Surgery, Iran University of Medical Sciences, Tehran, Iran
2. Department of Epidemiology, School of Public Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran
3. Minimally Invasive Surgery Research Center, Rasool -e Akram Hospital, Iran University of Medical Sciences, Tehran, Iran
4. General Surgery and Minimally Invasive Surgery, Iran University of Medical Science, Minimally Invasive Research Center, Center of Excellence of European Branch of International Federation for Surgery of Obesity, Tehran, Iran
5. General Surgery and Plastic Surgery, Iran University of Medical Science, Minimally Invasive Research Center, Center of Excellence of European Branch of International Federation for Surgery of Obesity, Tehran, Iran
6. Private Office, Tehran, Iran