1. St George's University Hospitals NHS Foundation Trust London UK
2. Unit of Obstetrics and Gynecology, Azienda Unità Sanitaria LocaleIstituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Azienda Unità Sanitaria Locale Reggio Emilia Italy
3. Department of Medicine and Surgery, Obstetrics and Gynecology UnitUniversity of Parma Parma Italy
4. Department of Surgery and Cancer, Institute of Reproductive and Developmental BiologyImperial College London London UK