1. Department of Obstetrics and Gynaecology, IRCCS-Fondazione Policlinico San Matteo, University of Pavia, Pavia, Italy
2. Department of Obstetrics and Gynaecology, IRCCS Azienda Ospedaliera Universitaria San Martino, IST Istituto Nazionale per la Ricerca sul Cancro, University of Genoa, Genoa, Italy