1. Department of Neurology, Poznan University of Medical Sciences, 60-355 Poznan, Poland
2. Department of Basic and Clinical Neuroscience, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London SE5 9RX, UK
3. Parkinson’s Foundation Centre of Excellence, King’s College Hospital, Denmark Hill, London SE5 9RS, UK
4. Division of Neurology, Medical Department, Tengku Ampuan Rahimah Hospital, Klang 41200, Malaysia