1. Department of Pediatric Surgery Guangzhou Institute of Pediatrics Guangdong Provincial Key Laboratory of Research in Structural Birth Defect Disease Guangzhou Women and Children's Medical Center Guangzhou Medical University Guangzhou Guangdong 510623 P. R. China
2. Department of Pathology Children's Hospital of Nanjing Medical University Nanjing Jiangsu 210008 P. R. China
3. Department of Pathology Anhui Provincial Children's Hospital Hefei Anhui 230051 P. R. China
4. Department of Clinical Laboratory Molecular Epidemiology Laboratory Harbin Medical University Cancer Hospital Harbin Heilongjiang 150040 P. R. China
5. Department of Pediatric Surgery the Affiliated Hospital of Qingdao University Qingdao Shandong 266000 P. R. China
6. Department of Hematology the Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University Wenzhou Zhejiang 325027 P. R. China