1. Department of Internal Medicine, Jahrom University of Medical Sciences, Jahrom, Iran
2. Health Policy Research Center, Institute of Health, Shiraz University of Medical Sciences, Shiraz, Iran
3. Department of Internal Medicine, Gastroenterohepatology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
4. Department of Pathobiology, School of Veterinary Medicine, Shiraz University, Shiraz, Iran