1. Sleep Medicine Unit, Neurocenter of Southern Switzerland, Ospedale Civico, Civic Hospital of Lugano, Via Tesserete 46, 6900 Lugano, Switzerland
2. Faculty of Biomedical Sciences, Università della Svizzera Italiana, 6900 Lugano, Switzerland
3. University Hospital of Psychiatry and Psychotherapy, University of Bern, 3000 Bern, Switzerland
4. Sleep Research Centre, Oasi Research Institute—IRCCS, 94018 Troina, Italy
5. Unit of Neurology, G.B. Morgagni–L. Pierantoni Hospital, 47121 Forlì, Italy
6. Department of Neurosciences, Neurological Clinic, University of Pisa, 56124 Pisa, Italy
7. Sleep Disorders Center, Vita-Salute San Raffaele University, 20132 Milan, Italy
8. Department of Neurology, Inselspital, Bern University Hospital, 3010 Bern, Switzerland