1 Department of Medicine, Christchurch School of Medicine, University of Otago, Christchurch, New Zealand; Department of General Medicine. Electronic address: david.jardine@cdhb.health.nz.
2 Department of Medicine, Christchurch School of Medicine, University of Otago, Christchurch, New Zealand; Department of Cardiology, Christchurch Hospital, Canterbury District Hospital Board, Christchurch, New Zealand.
3 Department of Cardiology, Christchurch Hospital, Canterbury District Hospital Board, Christchurch, New Zealand.