1. Department of Obstetrics and Gynecology, Nihon University, Tokyo, Japan.
2. Department of Obstetrics and Gynecology, St. Marianna University School of Medicine, Kawasaki, Japan.
3. Advanced Cancer Translational Research Institute, Showa University, Tokyo, Japan.
4. Palliative Care Center, Yao Municipal Hospital, Yao, Japan.
5. Department of Obstetrics and Gynecology, Tottori University Faculty of Medicine, Yonago, Japan.
6. Department of Obstetrics and Gynecology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan.
7. Department of Obstetrics and Gynecology, Faculty of Medical Sciences, University of Fukui, Fukui, Japan.