Affiliation: | 1. Research Institute for Infectious Diseases of Digestive System, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, , Ahvaz, Iran;2. Department of Epidemiology and Biostatistics, Faculty of Health, Ahvaz Jundishapur University of Medical Sciences, , Ahvaz, Iran;3. Department of Internal Medicine, Imam Khomeini Hospital, Ahvaz Jundishapur University of Medical Sciences, , Ahvaz, Iran |