1 Regional Referral Center for Inborn Errors Metabolism, Pediatric Clinic, Department of Clinical and Experimental Medicine, University of Catania, via Santa Sofia 78, Catania, Italy. Electronic address: agatafiumara@yahoo.it.
2 Child Neuropsychiatry, Department of Clinical and Experimental Medicine, University of Catania, Italy; CNR Institute for Polymers, Composites and Biomaterials IPCB, Catania, Italy.
3 Regional Referral Center for Inborn Errors Metabolism, Pediatric Clinic, Department of Clinical and Experimental Medicine, University of Catania, via Santa Sofia 78, Catania, Italy.
4 Pediatric Neurology and Muscular Diseases Unit, Dept of Neurosciences, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genoa, G. Gaslini Institute, Genova, Italy.
5 Center for Metabolic Disease, Department of Pediatrics, KU Leuven, Leuven, Belgium.