1 Obstetrics and Gynaecology Department, IRRCS San Raffaele Hospital and Vita-Salute San Raffaele University, Via Olgettina 58-60, 20132, Milan, Italy.
2 Department of Urogynaecology, King's College Hospital, London, UK.
3 First Department of Obstetrics and Gynaecology, National and Kapodistrian University of Athens, "Alexandra" General Hospital, 80 Vas. Sofias Avenue, 11528, Athens, Greece.