1. Department of Paediatrics, University of Chieti, Chieti, Italy
2. Department of Paediatrics, University of Perugia, Perugia, Italy
3. Paediatric Neurology and Muscular Disease Unit, IRCCS Istituto Giannina Gaslini, Genoa, Italy
4. Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genoa, Genoa, Italy