[1] Innsbruck Med Univ, Dept Neurol, Innsbruck, Austria
[2] Ctr Hosp Univ, Serv Pharmacol Clin, Toulouse, France
[3] UCL, Inst Neurol, London, England
[4] Hosp Clin Univ, Serv Neurol, Barcelona, Spain
[5] Univ Marburg, Dept Neurol, Marburg, Germany
[6] Univ Piemonte Orientale, Novara, Italy
[7] Schwarz Pharma, Monheim, Germany