1. Department of Physiology, HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
2. Department of Medicine, HeartOtago, Dunedin School of Medicine, Dunedin Hospital, Dunedin, New Zealand
3. Department of Cardiothoracic Surgery, Dunedin School of Medicine, Dunedin Hospital, Dunedin, New Zealand
4. Department of Cardiology, Waikato District Health Board, Hamilton, New Zealand
5. Waikato Clinical School, University of Auckland, Hamilton, New Zealand