[1] Sleep Res Inst, Madrid 28036, Spain
[2] Univ Vita Salute San Raffaele, Sleep Disorders Ctr, Milan, Italy
[3] Univ Erlangen Nurnberg, RPS Res Germany, Nurnberg, Germany
[4] Univ Erlangen Nurnberg, Dept Psychol, Nurnberg, Germany
[5] Galway Univ Hosp, Dept Geriatr Med, Galway, Ireland
[6] Ctr Parkinsonism & Movement Disorders, Paracelsus Elena Klin, Kassel, Germany
[7] Univ Goettingen, Dept Clin Neurophysiol, Kassel, Germany
[8] Innsbruck Med Univ, Dept Neurol, Innsbruck, Austria
[9] Univ Rostock, Somni Bene Inst Med Res & Sleep Med, Schwerin, Germany
[10] Univ Rostock, Dept Neurol, Schwerin, Germany
[11] Univ Copenhagen, Danish Ctr Sleep Med, Glostrup Hosp, Copenhagen, Denmark
[12] Univ Copenhagen, Ctr Hlth Aging, Copenhagen, Denmark
[13] Vitalmed Res Ctr, Helsinki Sleep Clin, Helsinki, Finland
[14] Univ Bologna, Dept Neurol Sci, Bologna, Italy
[15] Univ Bern, Inselspital, Univ Hosp, Dept Neurol, CH-3010 Bern, Switzerland
[16] Neuroctr So Switzerland, Lugano, Switzerland
[17] Hosp Clin Barcelona, Neurol Serv, Barcelona, Spain
[18] Hosp Clin Barcelona, Multidisciplinary Sleep Unit, Barcelona, Spain
[19] Ctr Invest Biomed Red Enfermedades Neurodegenerat, Barcelona, Spain
[20] IDIBAPS, Barcelona, Spain
[21] Charles Univ Prague, Dept Neurol, Fac Med 1, Prague, Czech Republic