1. Department of Neurology, National Neuroscience Institute, Tan Tock Seng Hospital, Singapore 308433, Singapore
2. Raffles Neuroscience Centre, Raffles Hospital, Singapore 188770, Singapore
3. Division of Neurology, Department of Medicine, National University Health System, Singapore 119228, Singapore
4. Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119077, Singapore
5. Department of Cardiology, National University Heart Center, Singapore 119228, Singapore
6. Department of Diagnostic Imaging, National University Health System, Singapore 119228, Singapore