1. Chulalongkorn Center of Excellence on Parkinson Disease & Related Disorders, Department of Medicine, Faculty of Medicine, Chulalongkorn University and King Chulalongkorn Memorial Hospital, Thai Red Cross Society, Bangkok, Thailand
2. Department of Neurology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
3. Biomedical Signal Processing Laboratory, National Electronics and Computer Technology Center (NECTEC), Pathumthani, Thailand