1. Laboratory of Histopathology and Cytopathology, Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, Maebashi, Gunma 371‑8514, Japan
2. Department of Obstetrics and Gynecology, Gunma University Graduate School of Medicine, Maebashi, Gunma 371‑8511, Japan
3. Clinical Department of Pathology, Gunma University Hospital, Maebashi, Gunma 371‑8511, Japan
4. Department of Human Pathology, Gunma University Graduate School of Medicine, Maebashi, Gunma 371‑8511, Japan