Massimiliano Fambrini1, Flavia Sorbi, Secondo Guaschino. 1. Department of Science for Woman and Child Health, Azienda Ospedaliera Universitaria Careggi, University of Florence, Florence, Italy Department of Science for Woman and Child Health, Azienda Ospedaliera Universitaria Careggi, University of Florence, Florence, Italy Department of Science for Woman and Child Health, Azienda Ospedaliera Universitaria Careggi, University of Florence, Florence, Italy.