1. Division of Surgery, Hidaka Hospital, Takasaki, Gunma 370‑0001, Japan
2. Initiative for Advanced Research, Gunma University, Maebashi, Gunma 371‑8511, Japan
3. Department of General Surgical Science, Graduate School of Medicine, Gunma University, Maebashi, Gunma 371‑8511, Japan
4. Department of Radiation Oncology, Saitama Medical Center, Saitama Medical University, Kawagoe, Saitama 350‑8550, Japan
5. Division of Cancer Diagnosis and Cancer Treatment, Hidaka Hospital, Takasaki, Gunma 370‑0001, Japan