[1] Hosp Santa Creu & Sant Pau, Unit Movement Disorders, Neurol, Barcelona, Spain
[2] Hosp Clin Univ Barcelona, Parkinson Dis & Movement Disorder Unit, Barcelona, Spain
[3] Inst Med Mol, Neurol Clin Res Unit, Lisbon, Portugal
[4] Natl Hosp Neurol & Neurosurg, London, England
[5] BIAL Portela & Co SA, Global Parkinson Dis, Sao Mamede do Coronado, Portugal
[6] BIAL Portela & Co SA, Res & Dev, Sao Mamede do Coronado, Portugal