1 Department of Gastroenterology, The Children's Hospital of Xi'an City, Xi'an, Shaanxi Province, China.
2 Department of Radiology, The Children's Hospital of Xi'an City, Xi'an, Shaanxi Province, China.
3 Department of General Surgery, The Children's Hospital of Xi'an City, Xi'an, Shaanxi Province, China.
4 State Key Laboratory of Cancer Biology and National Clinical Research Center for Digestive Diseases, Xijing Hospital of Digestive Diseases, Air Force Medical University, Xi'an, Shaanxi Province, China.