1 Department of Obstetrics and Gynecology, IRCCS Foundation Policlinico San Matteo, Pavia, Italy; Department of Clinical, Surgical, Diagnostic and Paediatric Sciences, University of Pavia, Pavia, Italy. Electronic address: m.dominoni@smatteo.pv.it.
2 Department of Obstetrics and Gynecology, IRCCS Foundation Policlinico San Matteo, Pavia, Italy; Department of Clinical, Surgical, Diagnostic and Paediatric Sciences, University of Pavia, Pavia, Italy.