1. Clinica Valle Giulia, G.EN.E.R.A. Centers for Reproductive Medicine, Rome, Italy;
2. Department of Obstetrics and Gynecology, University of Cagliari, Policlinico Universitario Duilio Casula, Monserrato, Cagliari, Italy;
3. Department of Neuroscience, Reproductive Science and Odontostomatology, University of Naples Federico II, Naples, Italy;
4. Catholic University of the Sacred Heart, Rome, Italy;
5. Department of Veterinary Medicine, University of Sassari, Sassari, Italy