1. Alimentary Tract Research Center, Clinical Sciences Research Institute, Imam Khomeini Hospital, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
2. Department of Genetic, Faculty of Science, Qom Branch, Islamic Azad University, Qom, Iran
3. Colorectal Research Center, Iran University of Medical Sciences, Tehran, Iran
4. Department of Internal Medicine, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
5. Department of Biochemistry, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
6. Immunogenetics Research Center, Department of Medical Nanotechnology, School of Advanced Technologies in Medicine, Mazandaran University of Medical Sciences, Sari, Iran
7. Occupational Medicine Research Center, Iran University of Medical Sciences, Tehran, Iran