1. Department of Gastroenterology, Jundishapur University of Medical Sciences, Ahvaz, Iran
2. Msc in Microbiology, Islamic Azad University North Branch of Tehran, Tehran, Iran
3. Department of Gastroenterology, Bushehr University of Medical Sciences, Bushehr, Iran
4. Department of Pathology, Shiraz University of Medical Sciences, Shiraz, Iran
5. Liver and Gastrointestinal Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, Iran