1. Division of the Gastrointestinal, Endocrine and Pediatric Surgery, Department of Surgery, Faculty of Medicine University of Miyazaki Miyazaki Japan
2. Department of Surgery, Faculty of Medicine University of Miyazaki Miyazaki Japan
3. Division of Hepato‐Biliary‐Pancreatic Surgery, Department of Surgery, Faculty of Medicine University of Miyazaki Miyazaki Japan
4. Department of Pediatric Surgery, Research Field in Medical and Health Sciences, Medical and Dental Area, Research and Education Assembly Kagoshima University Kagoshima City Japan