[1] Univ Coll Hosp, Natl Hosp Neurol & Neurosurg, Queen Sq, London, England
[2] Inst Med Mol, Neurol Clin Res Unit, Lisbon, Portugal
[3] BIAL Portela & Co SA, Res & Dev, Sao Mamede do Coronado, Portugal
[4] BIAL Portela & Co SA, Global Parkinson Dis, Sao Mamede do Coronado, Portugal