1. Neurological UnitSt. Bassiano Hospital Bassano del Grappa Italy
2. Charles Dent Metabolic UnitNational Hospital for Neurology and Neurosurgery London UK
3. Department of Medicine and SurgeryUniversity of Salerno Salerno Italy
4. Division of Inborn Metabolic Diseases, Department of PaediatricsUniversity Hospital Padua Italy
5. Division of Metabolic Diseases, Beatrix Children's HospitalUniversity Medical Center of Groningen, University of Groningen Groningen The Netherlands