1. IRCCS Istituto delle Scienze Neurologiche di Bologna, Bologna, Italy
2. Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy
3. Sleep Research Centre, Department of Neurology I.C., Oasi Research Institute-IRCCS, Troina, Italy
4. Centre for Narcolepsy, Department of Psychiatry and Behavioral Sciences, Stanford University, Palo Alto, CA