1. Medically Assisted Procreation Center, Maternal and Child Department, Beauregard Hospital, Valle D’Aosta Local Public Health, 11100 Aoste, Italy
2. Department of Medical and Surgical Sciences, University of Bologna, 40126 Bologna, Italy
3. Division of Gynaecology and Human Reproduction Physiopathology, IRCCS Azienda Ospedaliero, University of Bologna, 40138 Bologna, Italy
4. Clinical Genetics and Epidemiology Unit, University of Padova, 35128 Padova, Italy