1. National University of Singapore, Saw Swee Hock School of Public Health, Singapore
2. Department of Electrical and Computer Engineering, National University of Singapore, Singapore
3. Department of Rehabilitation Medicine, Singapore General Hospital, Singapore
4. Department of Neurology, National Neuroscience Institute, Singapore
5. Department of Surgery, Duke University Medical Center, USA
6. Department of Rehabilitation Medicine, National University Hospital, Singapore
7. Physical Medicine and Rehabilitation Service, Durham Veterans Affairs Medical Center, USA
8. Department of Medicine, Duke University Medical Center, USA