1. Medical Genetics Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, 40138 Bologna, Italy
2. Department of Medical and Surgical Sciences, University of Bologna, 40138 Bologna, Italy
3. Department of Medicine and Surgery, University of Perugia, 06123 Perugia, Italy
4. Laboratory of Neurogenetics, European Center for Brain Research (CERC), IRCCS Santa Lucia Foundation, 00143 Rome, Italy