1. Department of Obstetrics and Gynecology, University of Cagliari; Policlinico Universitario Duilio Casula; Monserrato Cagliari Italy
2. Department of Radiology; Azienda Ospedaliero Universitaria (A.O.U.); Monserrato Italy
3. Department of Obstetrics, Gynecology and Reproduction; Institut Universitari Dexeus; Barcelona Spain
4. Department of Obstetrics and Gynecology, Clínica Universidad de Navarra, School of Medicine; University of Navarra; Pamplona Spain