1. Department of Physiology, School of Biomedical Sciences (P.P., I.v.H., F.J.M., M.F.), University of Otago, Dunedin, New Zealand.
2. HeartOtago (P.P., I.v.H., S.C., M.F.), University of Otago, Dunedin, New Zealand.
3. Department of Cardiothoracic Surgery, Otago Medical School, Dunedin Hospital, New Zealand (R.W.B., D.J.P.).
4. Department of Medicine, Otago Medical School (S.C.), University of Otago, Dunedin, New Zealand.