Department of Obstetrics and Gynecology, Fondazione IRCCS Policlinico San Matteo, Piazzale Golgi 19, 27100, Pavia, Italy; Department of Clinical-Surgical, Diagnostic and Pediatric Sciences, University of Pavia, Corso Strada Nuova 65, 27100, Pavia, Italy. Electronic address: silviafumanelli95@gmail.com.