1. Gynaecologic and Obstetric Clinic, Department of Medical, Surgical and Experimental Sciences, University of Sassari, Sassari, Italy
2. Gynaecologic and Obstetric Clinic, Department of Surgical Sciences, University of Cagliari, Cagliari, Italy
3. Gynaecologic and Obstetric Clinic, Department of Obstetrics and Gynaecology, Pisa University, Pisa, Italy