1. Department of Neurology and Neurosurgery National Institute of Health Yerevan Armenia
2. Sleep Disorders Center Somnus Neurology Clinic Yerevan Armenia
3. Oasi Research Institute IRCCS Troina Italy
4. Sleep Medicine Unit Neurocenter of Southern Switzerland, Ospedale Civico Lugano Switzerland
5. International Sleep Institute Madrid Spain
6. Department of Neurology University Hospital Inselspital Bern Switzerland
7. Center for Parkinson's Disease and Movement Disorders Paracelsus‐Elena Klinik Kassel Germany
8. Sleep Disorders Clinic, Department of Neurology Medical University of Innsbruck Innsbruck Austria