[1] Univ Goettingen, Dept Clin Neurophysiol, Kassel, Germany
[2] Paracelsus Elena Klin, Ctr Parkinsonism & Movement Disorders, Kassel, Germany
[3] Univ Cape Town, Div Neurol, ZA-7700 Rondebosch, South Africa
[4] Jagiellonian Univ, Coll Med, Dept Neurol, Krakow, Poland
[5] Constantiaberg MediClin, Cape Town, South Africa
[6] Hosp Zala Cty, Dept Neurol, Zalaegerszeg, Hungary
[7] Pomeranian Med Univ, Neurol Clin, Szczecin, Poland
[8] Cty Hosp, Dept Neurol, Nyiregyhaza, Hungary
[9] Cent Carolina Neurol & Sleep, Salisbury, NC USA
[10] Univ Otago, Dept Med, Christchurch, New Zealand
[11] Van Der Veer Inst, Christchurch, New Zealand
[12] Oulu Univ Hosp, Dept Neurol, Oulu, Finland
[13] Univ Ulm, Neurol Klin, Ulm, Germany
[14] Walton Ctr Neurol & Neurosurg, Liverpool, Merseyside, England
[15] Inst Sci H San Raffaele, Ctr Disturbi Sonno, I-20132 Milan, Italy
[16] Univ Barcelona, Hosp Clin, Ctr Invest Biomed Red Enfermedades Neurodegenerat, Neurol Serv,IDIBAPS, E-08007 Barcelona, Spain
[17] Med Univ Innsbruck, Dept Neurol, Innsbruck, Austria
[18] UCB Pharma GmbH, Monheim, Germany
[19] Schwarz Biosci Inc, Raleigh, NC USA
[20] Kings Coll Hosp London, NPF Ctr Excellence, London, England
[21] Kings Coll London, Univ Hosp Lewisham, London WC2R 2LS, England
[22] Inst Psychiat, London, England