Department of Surgery, Keio University School of Medicine, Tokyo, 1608582, Japan.Department of Surgery, Keio University School of Medicine, Tokyo, 1608582, Japan. dragonpegasus@keio.jp.Department of Surgery, Keio University School of Medicine, Tokyo, 1608582, Japan.Department of Surgery, Keio University School of Medicine, Tokyo, 1608582, Japan.Department of Surgery, Keio University School of Medicine, Tokyo, 1608582, Japan.Department of Surgery, Keio University School of Medicine, Tokyo, 1608582, Japan.Department of Surgery, Tokyo Saiseikai Central Hospital, Tokyo, Japan.Department of Surgery, Keio University School of Medicine, Tokyo, 1608582, Japan.Department of Pathology, Keio University School of Medicine, Tokyo, Japan.Department of Surgery, Keio University School of Medicine, Tokyo, 1608582, Japan.