1. Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan.
2. Gynecologic Tumor Committee, Japan Society of Obstetrics and Gynecology, Tokyo, Japan.
3. Department of Obstetrics and Gynecology, Yamagata University School of Medicine, Yamagata, Japan.
4. Department of Clinical Research Network, Clinical Research, Innovation and Education Center, Tohoku University Hospital, Sendai, Japan.
5. Department of Obstetrics and Gynecology, Wakayama Medical University, Wakayama, Japan.
6. Department of Obstetrics and Gynecology, University of Occupational and Environmental Health Japan, Kitakyushu, Japan.
7. Department of Obstetrics and Gynecology, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan.