[1] Cty Clin Hosp Brasov, Dept Neurol, Brasov, Romania
[2] Transilvania Univ Brasov, Fac Med, Brasov, Romania
[3] Med Univ Innsbruck, Dept Neurol, Innsbruck, Austria
[4] Parkinsons Dis & Movement Disorder Res Ctr, Citi Neuro Ctr, Hyderabad, India
[5] Kings Coll London, Inst Psychiat Psychol & Neurosci, Dept Basic & Clin Neurosci, London, England
[6] Kings Coll Hosp London, Parkinsons Fdn Ctr Excellence, London, England
[7] Kings Coll Hosp London, Parkinsons Fdn Ctr Excellence, Dubai, U Arab Emirates