1. Department of General Surgery, Capital Institute of Pediatrics, Beijing, China.
2. Department of Medical Genetics, Capital Institute of Pediatrics, Beijing, China.
3. Department of Radiology, Capital Institute of Pediatrics, Beijing, China.
4. Department of Pathology, Capital Institute of Pediatrics, Beijing, China.
5. Department of Ultrasound, Capital Institute of Pediatrics, Beijing, China.