1 Centre for Heart Rhythm Disorders, University of Adelaide and Royal Adelaide Hospital, Adelaide, SA, 5000, Australia. catherine.oshea@adelaide.edu.au.
2 Centre for Heart Rhythm Disorders, University of Adelaide and Royal Adelaide Hospital, Adelaide, SA, 5000, Australia.
3 Department of Cardiology, Alfred Hospital and the Baker IDI, Melbourne, Australia.
4 Department of Cardiology, Royal Melbourne Hospital, Parkville, Australia.
5 Department of Medicine, University of Melbourne, Melbourne, Australia.