1 Department of Pediatrics, University of L'Aquila, L'Aquila, Italy. Electronic address: alberto.verrottidipianella@univaq.it.
2 Department of Pediatrics, University of L'Aquila, L'Aquila, Italy. Electronic address: difrancesco.ludovica@gmail.com.
3 Pediatric Neurology and Muscular Diseases Unit, Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, 'G. Gaslini' Institute, University of Genoa, Genova, Italy. Electronic address: strianop@gmail.com.