1. Department of Pathology, Kanagawa Prefectural Ashigarakami Hospital, Matsuda, Kanagawa 258-0003, Japan
2. Department of Gynecology and Obstetrics, Seto Hospital, Tokorozawa, Saitama 359-1128, Japan
3. Department of Pathology, Saitama Medical University International Medical Center, Hidaka, Saitama 350-1298, Japan
4. Laboratory of Pathology, Department of Medical Biophysics, Kobe University Graduate School of Health Sciences, Kobe, Hyogo 654‑0142, Japan
5. Department of Gynecology, Kanagawa Cancer Center, Yokohama, Kanagawa 241-8515, Japan