1. Institute of Medical Genetics; Catholic University; University Hospital A. Gemelli; Roma Italy
2. Department of Human Genetics; Radboud University Nijmegen Medical Centre; Nijmegen The Netherlands
3. Institute of Medical Genetics; University of Zurich; Zurich Switzerland
4. Department of Pediatric Neurology; Catholic University; University Hospital A. Gemelli; Roma Italy
5. Institute Santa Caterina; Francavilla (Chieti) Italy