1. Department of Clinical and Biological Sciences, University of Insubria, Italy.
2. University Centre for Adaptive Disorders and Headache (UCADH), Italy.
3. Laboratory of Neurological Disorders, Mario Negri Institute, Italy.
4. Statistics and Mathematic Unit, DEPA, University of Milan, Italy.
5. University of Pavia, Italy.
6. Child Neuropsychiatry Unit, IRCCS 'C. Mondino Institute of Neurology' Foundation, Italy.