1. Department of Neurology, Inselspital Bern University Hospital and University of Bern Bern Switzerland
2. Center for Narcolepsy/Hypersomnias Clin. Sleep and Neuroimmunology, Institute of Immunology University Witten/Herdecke Witten Germany
3. IRCCS, Istituto delle Scienze Neurologiche di Bologna UOC Clinica Neurologica Bologna Italy
4. Department of Biomedical, Metabolic and Neural Sciences University of Modena and Reggio Emilia Modena Italy
5. AP‐HP, Pediatric Sleep Center CHU Robert‐Debré Paris France
6. National Reference Centre for Orphan Diseases, Narcolepsy, Idiopathic Hypersomnia and Kleine‐Levin Syndrome (CNR narcolepsie‐hypersomnie) Paris France
7. Institute of Clinical Neurophysiology University Medical Centre Ljubljana Ljubljana Slovenia
8. Department of Neurology Faculty of Medicine University of Ljubljana Ljubljana Slovenia
9. Danish Center for Sleep Medicine Department of Clinical Neurophysiology Faculty of Health Sciences Rigshospitalet University of Copenhagen Copenhagen Denmark
10. Center of Sleep Medicine Sleep Research and Epileptology Clinic Barmelweid Barmelweid Switzerland
11. Sleep Center Faculty of Biomedical Sciences Neurocenter of Southern Switzerland Università della Svizzera Italiana Lugano Switzerland
12. Neurology Department Hephata Klinik Schwalmstadt Germany
13. Department of Neurology Philipps‐Universität Marburg Marburg Germany
14. Department of Clinial Neurosciences, Clinicum, Helsinki Sleep Clinic Vitalmed Research Center Terveystalo Biobank and Clinical Research University of Helsinki Helsinki Finland
15. Center for Mental Health Klinikum Ingolstadt Ingolstadt Germany
16. Department of Neurology James Cook University Hospital Middlesbrough UK
17. Neurology Service Hospital Clínic of Barcelona Barcelona Spain
18. Department of Neurology and Center of Clinical Neuroscience First Faculty of Medicine Charles University and General University Hospital Prague Czech Republic
19. National Reference Centre for Orphan Diseases, Narcolepsy, Idiopathic Hypersomnia, Sleep Unit Department of Neurology Gui‐de‐Chauliac Hospital, CHU Montpellier University of Montpellier, INM INSERM Montpellier France
20. Sleep Wake Centre SEIN Heemstede The Netherlands
21. Department of Neurology Leiden University Medical Centre Leiden The Netherlands