1. Department of Obstetrics and Gynecology School of Medicine Tottori University Yonago Japan
2. Department of Obstetrics and Gynecology Matsue City Hospital Matsue Japan
3. Department of Obstetrics and Gynecology Shimane Prefectural Central Hospital Izumo Japan
4. Medical Checkup Center Chiba Foundation for Health Promotion & Disease Prevention Chiba Japan
5. Department of Obstetrics and Gynecology School of Medical Sciences Fukui University Eiheiji‐cho Japan
6. Hamada Ladies Clinic Miyazaki Japan
7. Cytology Center Hokkaido Cancer Society Sapporo Japan
8. Department of Obstetrics and Gynecology School of Medicine Jichi Medical University Shimotsuke Japan
9. Department of Gynecology and Obstetrics Faculty of Medicine Saga University Saga Japan
10. Department of Obstetrics and Gynecology Faculty of Medicine Hokkaido University Sapporo Japan
11. Cancer Center Shin‐Yurigaoka General Hospital Kawasaki Japan