1. Cancer Treatment Center, Kochi Medical School Hospital, Kochi University, Nankoku, Kochi 783‑8505, Japan
2. Department of Gastroenterological, Breast and Endocrine Surgery, Yamaguchi University Graduate School of Medicine, Ube, Yamaguchi 755‑8505, Japan
3. Cancer Center, Aichi Medical University, Nagakute, Aichi 480‑1195, Japan
4. Department of Biostatistics, Graduate School of Medicine, University of Tokyo, Bunkyo, Tokyo 113‑0033, Japan
5. Division of Laboratory, Yamaguchi University Hospital, Ube, Yamaguchi 755‑8505, Japan
6. Department of Oncology and Laboratory Medicine, Yamaguchi University Graduate School of Medicine, Ube, Yamaguchi 755‑8505, Japan
7. Tokai Central Hospital, Kakamigahara, Gifu 504‑8601, Japan
8. Kitakyushu General Hospital, Kitakyushu, Fukuoka 802‑8517, Japan