1. Department of Pediatric Gastroenterology, Children’s Medical Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
2. Department of Pediatrics, Children’s Medical Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
3. Department of Pediatric Infectious Disease, Children’s Medical Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
4. Alimentary Tract Research Center, Clinical Sciences Research Institute, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
5. Department of Biostatistics, Faculty of Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran