1. Department of Surgery, Kochi Medical School Hospital Kochi University Nankoku Japan
2. Department of Gastrointestinal Surgery Kochi Red Cross Hospital Kochi Japan
3. Integrated Center for Advanced Medical Technologies (ICAM‐Tech), Kochi Medical School Hospital Kochi University Nankoku Japan
4. Department of Endocrinology, Metabolism and Nephrology, Kochi Medical School Hospital Kochi University Nankoku Japan