1. University Department of Cardiac Surgery, Leipzig Heart Center , Leipzig, Germany
2. Department of Cardiac Surgery, Rostock University Hospital , Rostock, Germany
3. Department of Cardiothoracic Surgery, Royal Prince Alfred Hospital , Sydney, NSW, Australia
4. Sydney Medical School, University of Sydney , Sydney, NSW, Australia
5. Institute of Academic Surgery, Royal Prince Alfred Hospital , Sydney, NSW, Australia
6. The Baird Institute of Applied Heart and Lung Surgical Research , Sydney, NSW, Australia