1. Department of Gastrointestinal Tract Surgery, Fukushima Medical University School of Medicine, Fukushima, Fukushima 960‑1295, Japan
2. Department of Breast Surgery, Fukushima Medical University School of Medicine, Fukushima, Fukushima 960‑1295, Japan
3. Department of Cellular and Organ Pathology, Akita University Graduate School of Medicine, Akita, Akita 010‑8543, Japan
4. Division of Molecular Pathology, The Institute of Medical Science, The University of Tokyo, Tokyo 108‑8639, Japan