Affiliation: | 1. Department of Cardiac Surgery, Liverpool Heart and Chest Hospital, Liverpool, United Kingdom;2. Liverpool Centre for Cardiovascular Science, University of Liverpool and Liverpool Heart and Chest Hospital, Liverpool, United Kingdom;1. Clinic for Cardiac Surgery, University Hospital Zürich, Zürich, Switzerland;2. Department of Cardiothoracic Surgery, the University of the Free State, Bloemfontein, South Africa |