1 Department of Cardiology, National University Heart Centre, Singapore; Yong Loo Lin School of Medicine, National University Singapore, Singapore. Electronic address: eugene_sj_tan@nuhs.edu.sg.
2 Department of Cardiology, National University Heart Centre, Singapore.
3 Department of Cardiology, Ng Teng Fong General Hospital, Singapore.
4 Department of Cardiology, National University Heart Centre, Singapore; Yong Loo Lin School of Medicine, National University Singapore, Singapore.
5 Department of Cardiology, Changi General Hospital, Singapore.
6 Department of Cardiology, National University Heart Centre, Singapore; Yong Loo Lin School of Medicine, National University Singapore, Singapore; Department of Cardiology, Ng Teng Fong General Hospital, Singapore.