1. Chulalongkorn Centre of Excellence for Parkinson’s Disease and Related Disorders, Department of Medicine, Faculty of Medicine , Chulalongkorn University and King Chulalongkorn Memorial Hospital, Thai Red Cross Society , Bangkok , Thailand
2. Division of Neurology, Department of Medicine, Faculty of Medicine , Chulalongkorn University , Bangkok , Thailand
3. The Academy of Science, The Royal Society of Thailand , Bangkok , Thailand
4. Human Motor Control Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health , Bethesda , MD , , USA