1. Obstetrics and Gynaecology, University of Perugia, Perugia, Italy
2. Faculty of Caring Science, Sahlgrenska Academy, University of Gothenburg, Borås, Sweden
3. Università Degli Studi di Perugia, Perugia, Italy
4. 2Nd Department of Obstetrics and Gynecology, I M Sechenov First Moscow State Medical University, Moscow, Russia