1. Departments of Radiology; Saitama Children's Medical Center; Saitama Japan
2. Department of Radiology; Keio University School of Medicine; Tokyo Japan
3. Department of Diagnostic and Interventional Radiology; University of Tsukuba Hospital; Ibaraki Japan
4. Departments of Surgery; Saitama Children's Medical Center; Saitama Japan
5. Department of Pediatric Surgery; Nagoya University Graduate School of Medicine; Saitama Japan
6. Department of Pediatrics; Saitama City Hospital; Saitama Japan