Affiliation: | aDepartment of Cardiothoracic Surgery, University Hospitals of Coventry and Warwickshire NHS Trust, Walsgrave Hospital, Coventry bDepartment of Cardiology, University Hospitals of Coventry and Warwickshire NHS Trust, Walsgrave Hospital, Coventry cDepartment of Statistics, School of Computing and Mathematics, Keele University, Keele, United Kingdom |