1. Institute of Gynaecology and Obstetrics, Department of Medicine, University of Udine, Udine, Italy;
2. Sexual and Reproductive Health Service, UGC Dr Cayetano Roldan San Fernando Health Centre, Cadiz, Spain;
3. Department of Obstetrics and Gynaecology, Basel University Hospital, Basel, Switzerland;
4. Department of Gynaecology, Faculty of Medicine, Paris Descartes University, Paris, France