[1] Univ Hosp Bispebjerg, Movement Disorder Clin, Dept Neurol, DK-2400 Copenhagen, Denmark
[2] Klin Donaustadt, Dept Neurol, Vienna, Austria
[3] Klin Donaustadt, Karl Landsteiner Inst Neuroimmunol & Neurodegenera, Vienna, Austria
[4] Chulalongkorn Univ, Fac Med, Chulalongkorn Ctr Excellence Parkinsons Dis & Rela, Dept Med, Bangkok, Thailand
[5] King Chulalongkorn Mem Hosp, Thai Red Cross Soc, Bangkok, Thailand
[6] Royal Soc Thailand, Acad Sci, Bangkok, Thailand
[7] Sigma Stat Serv, Balmullo, England
[8] Britannia Pharmaceut Ltd, Reading, Berks, England
[9] UCL, Queen Sq Inst Neurol, Queen Sq, London, England
[10] Natl Hosp, Queen Sq, London, England