1 Cardiothoracic Intensive Care Unit, Oxford Heart Centre, John Radcliffe Hospital-Oxford University Hospitals, Oxford, United Kingdom; School of Anaesthesia and Intensive Care, University of Catania, Catania, Italy.
2 Cardiothoracic Intensive Care Unit, Oxford Heart Centre, John Radcliffe Hospital-Oxford University Hospitals, Oxford, United Kingdom.
3 Cardiothoracic Intensive Care Unit, Oxford Heart Centre, John Radcliffe Hospital-Oxford University Hospitals, Oxford, United Kingdom; School of Anaesthesia and Intensive Care, University of Catania, Catania, Italy; IRCCS-ISMETT (Istituto Mediterraneo per i Trapianti e Terapie ad alta specializzazione), Palermo, Italy.