1. Department of Surgery, Kansai Medical University, Hirakata, Osaka 573‑1010, Japan
2. Department of Genome Biology, Kindai University Faculty of Medicine, Osakasayama, Osaka 589‑8511, Japan
3. Department of Pathology, Osaka Medical and Pharmaceutical University, Takatsuki, Osaka 569‑8686, Japan
4. Department of Hepato‑Biliary‑Pancreatic Surgery, Osaka Metropolitan University Graduate School of Medicine, Osaka, Osaka 545‑8585, Japan
5. Department of Surgery, Kindai University Faculty of Medicine, Osakasayama, Osaka 589‑8511, Japan
6. Department of Pathology, Kansai Medical University, Hirakata, Osaka 573‑1010, Japan