1. Department of Pathology, Bahrami Children Hospital, Affiliated with Tehran University of Medical Sciences, Tehran, Iran
2. Roshan Azma Pathobiology Lab, Private Lab Specialized in Pediatric Gastrointestinal and Hepatic Pathology, Tehran, Iran
3. Pediatric Gastro Enterologist, Milad Hospital, Tehran, Iran
4. Department of Pathology, Tehran University of Medical Sciences, Tehran, Iran