1. Department of Gastroenterological Surgery, Osaka University Graduate School of Medicine, Suita, Osaka 565‑0871, Japan
2. Department of Statistical Genetics, Osaka University Graduate School of Medicine, Suita, Osaka 565‑0871, Japan
3. Department of Traumatology and Acute Critical Medicine, Osaka University Graduate School of Medicine, Suita, Osaka 565‑0871, Japan