1. Division of Pediatric Surgery, Department of Surgery Kobe University Graduate School of Medicine Kobe Japan
2. Division of Hepato‐Biliary‐Pancreatic Surgery, Department of Surgery Kobe University Graduate School of Medicine Kobe Japan
3. Department of Hematology and Oncology Hyogo Prefectural Kobe Children's Hospital Kobe Japan
4. Department of Pediatric Surgery Hyogo Prefectural Kobe Children's Hospital Kobe Japan