1. Department of Cardiology, National University Heart Centre Singapore, 1E Kent Ridge Road, NUHS Tower Block Level 9, Singapore 119228, Singapore
2. Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119228, Singapore
3. Division of Neurology, Department of Medicine, National University Health System, Singapore 119228, Singapore
4. Division of Interventional Radiology, Department of Diagnostic Imaging, National University Health System, Singapore 119228, Singapore