1. Department of Obstetrics and Gynecology, Tohoku University Graduate School of Medicine, Sendai, Japan
2. Department of Obstetrics and Gynecology, Tohoku Medical and Pharmaceutical University, Sendai, Japan
3. Clinical Research, Innovation and Education Center, Tohoku University Hospital, Sendai, Japan
4. Department of Gynecology, Miyagi Cancer Center, Sendai, Japan
5. Department of Gynecology, Shikoku Cancer Center, Matsuyama, Japan