1 Department of Cardiology, Royal North Shore Hospital, Sydney, NSW, Australia; Faculty of Medicine and Health, University of Sydney, Sydney, NSW, Australia. Electronic address: hari.sritharan@sydney.edu.au.
2 Department of Cardiology, Gosford Hospital, Gosford, Australia.
3 Department of Cardiology, Gosford Hospital, Gosford, Australia; University of Newcastle-Central Coast Clinical School, Gosford, NSW, Australia.