Bahar Ashjaei ¹ , Fatemeh Farahmand ², Mohammad Vasei ³, Fatemeh Zamani ⁴, Mohammad Taghi Haghi Ashtiani ³, Alireza Moradzadeh ², Moeinadin Safavi <sup>3*

1</sup> Pediatric Surgery Department, Children Medical Center, Tehran University of Medical Sciences, Tehran, Iran
² Pediatrics Gastroenterology Department, Children Medical Center, Tehran University of Medical Sciences, Tehran, Iran
³ Pathology Department, Children Medical Center, Tehran University of Medical Sciences, Tehran, Iran
⁴ Radiology Department, Children Medical Center, Tehran University of Medical Sciences, Tehran, Iran

*Corresponding Author: *Corresponding Authors: Moeinadin Safavi, MD; Children’s Medical Center, Tehran University of Medical Sciences, Tehran, Iran. Tel: +98-2161472405. Emails: moein.safavi@gmail.com, , Email: msafavi@sina.tums.ac.ir