1. Northern Clinical School of Medicine, University of Sydney, Kolling Institute, St Leonards, Sydney, NSW, Australia
2. Department of Cardiothoracic Surgery, Royal North Shore Hospital, St Leonards, Sydney, NSW, Australia
3. School of Biomedical Engineering, Faculty of Engineering and IT, University of Technology Sydney (UTS), Ultimo, Sydney, NSW, Australia
4. Department of Cardiothoracic Surgery, University Hospital of Wales, Cardiff, UK