1 Yong Loo Lin School of Medicine, National University of Singapore, Singapore.
2 Department of Cardiology, National University Heart Centre, Singapore; Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore. Electronic address: ching_hui_sia@nuhs.edu.sg.
3 Division of Neurology, Department of Medicine, National University Health System, Singapore.
4 Department of Cardiology, National University Heart Centre, Singapore; Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.