1. Department of Pediatric General Surgery, Children's Hospital, Chongqing Medical University, Chongqing, P.R. China.
2. Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing, P.R. China.
3. Children's Hospital of Chongqing Medical University, Chongqing, P.R. China.
4. National Clinical Research Center for Child Health and Disorders Chongqing, P.R. China.
5. China International Science and Technology Cooperation base of Child development and Critical Disorders, Chongqing, P.R. China.
6. Department of Pediatric General Surgery, Chongqing University Three Gorges Hospital, Chongqing, P.R. China.