1. Department of Pediatrics, Chang-Gung University, Taoyuan, Taiwan
2. Department of Radiology, Chang Gung University, Taoyuan, Taiwan
3. Graduate Institute of Clinical Medical Sciences, Chang Gung University, Taoyuan, Taiwan
4. Department of Pediatric Surgery, Chang-Gung University, Taoyuan, Taiwan
5. Department of Pediatric Surgery, Capital Medical University, Beijing, China