1. Department of Mechanical Circulatory Support and Transplantation, National Institute of Cardiology, 04-628 Warsaw, Poland
2. Department of Anaesthesia and Critical Care, Harefield Hospital, Royal Brompton and Harefield NHS Foundation Trust, London SW3 6NP, UK
3. Department of Anaesthesia and Critical Care, Royal Brompton Hospital, Royal Brompton and Harefield NHS Foundation Trust, London SW3 6PY, UK
4. Department of Quantitative Methods and Information Technology, Kozminsky University, 03-301 Warsaw, Poland
5. Department of Cardiothoracic Transplantation and Mechanical Circulatory Support, Harefield Hospital, Royal Brompton and Harefield NHS Foundation Trust, London SW3 6PY, UK