1. Department of Bacteriology & Virology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
2. Department of Internal Medicine, Namazi Hospital, Shiraz, Iran
3. Occupational Health Engineering, HSE Unit, Shiraz Waste Management Organization, Shiraz, Iran
4. Gastroenterohepatology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran