[1] Med Univ Innsbruck, Dept Neurol, Innsbruck, Austria
[2] Univ Naples Federico 2, Dept Neurol Sci, I-80138 Naples, Italy
[3] Univ S Florida, Parkinsons Dis & Movement Disorders Ctr, Tampa, FL USA
[4] Juntendo Univ, Sch Med, Dept Neurol, Tokyo 113, Japan
[5] Toulouse Univ Hosp, INSERM, Clin Invest Ctr, Toulouse, France
[6] Inst Neurol, Univ Dept Clin Neurosci, London WC1N 3BG, England
[7] Boehringer Ingelheim Pharma RCV GmbH & Co KG, Vienna, Austria
[8] Boehringer Ingelheim France SAS, Reims, France