1 Unit of Neurology and Neurometabolic Diseases, Department of Medical, Surgical and Neurological Sciences, University of Siena, Viale Bracci 2, 53100, Siena, Italy.
2 Laboratory of Clinical Biochemistry, ASST-Brianza and Department of Medicine and Surgery, Hospital of Desio, University of Milano-Bicocca, Milan, Italy.
3 Unit of Neurology and Neurometabolic Diseases, Department of Medical, Surgical and Neurological Sciences, University of Siena, Viale Bracci 2, 53100, Siena, Italy. andrea.mignarri@ao-siena.toscana.it.