title: Reply.
authors: Cardiovascular Sciences Unit, National Heart and Lung Institute, Imperial College, London, United Kingdom.
authors: Bao
authors: B
authors: Nguyen
authors: Bristol Heart Institute and Clinical Trials & Evaluation Unit, University of Bristol, Bristol, United Kingdom.
authors: Barnaby
authors: B
authors: Reeves
authors: Bristol Heart Institute and Clinical Trials & Evaluation Unit, University of Bristol, Bristol, United Kingdom; Department of Cardiothoracic Surgery, Imperial College, London, United Kingdom.
authors: Gianni
authors: G
authors: Angelini
authors: Cardiovascular Sciences Unit, National Heart and Lung Institute, Imperial College, London, United Kingdom.
authors: Dorian
authors: D
authors: Haskard
authors: Department of Cardiovascular Science, University of Sheffield, Sheffield, S10 2RX, United Kingdom. Electronic address: paul.evans@sheffield.ac.uk.
authors: Paul
authors: P
authors: Evans