1. Women’s Medical Center, Sanno Medical Center, Tokyo, Japan
2. Department of Gynecology, Juno-Vesta Clinic Hatta, Chiba, Japan
3. Fukushima Medical Center for Children and Women, Fukushima Medical University, Fukushima, Japan
4. Department of Gynecology, Hamasite Clinic, Tokyo, Japan
5. Obstetrics and Gynecology Unit, Vita-Salute San Raffaele University and IRCCS San Raffaele Hospital, Milan, Italy