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1 Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy 2 IRCCS Istituto delle Scienze Neurologiche, AUSL di Bologna, Bologna, Italy 3 Department of Clinical and Experimental Medicine, University of Parma, Parma, Italy 4 Helsinki Sleep Clinic, Finnish Narcolepsy Research Centre, Vitalmed Research Centre, Helsinki, Finland 5 Department of Medical and Surgical Sciences, University of Bologna, Bologna, Italy 6 Centre for Epilepsy Surgery ‘C. Munari’, Centre of Sleep Medicine, Department of Neuroscience, Niguarda Hospital, Milan, Italy 7 Centre for Paediatric Sleep Disorders, Department of Developmental Neurology and Psychiatry, University of Rome ‘La Sapienza’, Rome, Italy 8 Centre for Narcolepsy, Department of Psychiatry and Behavioural Sciences, Stanford University, Palo Alto, California, USA 9 Sobell Department of Motor Neuroscience and Movement Disorders, UCL Institute of Neurology, Queen Square, London, UK 10 Department of Neurology, Hôpital Gui-de-Chauliac, CHU Montpellier, National Reference Network for Narcolepsy, Inserm, Montpellier, France