1. Sleep Disorders Center, Department of Medicine and Surgery, University Hospital of Parma, Via Gramsci 14, 43126 Parma, Italy
2. Sleep Disorders Centre, Guy’s and St Thomas’ NHS Foundation Trust, London SE1 7EH, UK
3. Neurology Unit, Department of Medicine and Surgery, University Hospital of Parma, Via Gramsci 14, 43126 Parma, Italy