1. Department of Clinical Neurophysiology, University of Goettingen and Paracelsus‐Elena Klinik, Kassel, Germany
2. Neurology Division, University of Cape Town, South Africa
3. Department of Neurology, Jagiellonian University Medical College, Krakow, Poland
4. Constantiaberg MediClinic, Cape Town, South Africa
5. Department of Neurology, Hospital of Zala County, Zalaegerszeg, Hungary
6. Clinic of Neurology, Pomeranian Medical University, Szczecin, Poland
7. Department of Neurology, County Hospital, Nyiregyhaza, Hungary
8. Central Carolina Neurology and Sleep, Salisbury, North Carolina, USA
9. Department of Medicine, University of Otago, Christchurch, and Van Der Veer Institute, Christchurch, New Zealand
10. Department of Neurology, Oulu University Hospital, Oulu, Finland
11. Neurologische Klinik, Universität Ulm, Ulm, Germany
12. The Walton Centre of Neurology and Neurosurgery, Liverpool, United Kingdom
13. Centro per i Disturbi del Sonno, Instituto Scientifico H San Raffaele, Milan, Italy
14. Neurology Service, Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Hospital Clínic, IDIBAPS, Universitat de Barcelona, Spain
15. Department of Neurology, Medical University Innsbruck, Innsbruck, Austria
16. UCB Pharma GmbH, Monheim, Germany
17. Schwarz Biosciences Inc, a member of the UCB Group, Raleigh, NC, USA
18. NPF Centre of Excellence, Kings College Hospital and University Hospital Lewisham, Kings College and Institute of Psychiatry, London, United Kingdom