1 Department of Obstetrics and Gynecology 'L. Mangiagalli', Fondazione IRCCS Ca' Granda, Ospedale Maggiore Policlinico, Milan, Italy. Electronic address: ilma.carbone@policlinico.mi.it.
2 Department of Obstetrics and Gynecology 'L. Mangiagalli', Fondazione IRCCS Ca' Granda, Ospedale Maggiore Policlinico, Milan, Italy.
3 Department of Neuroscience, Reproductive Science and Odontostomatology, University of Naples Federico II, Naples, Italy.