1. Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford OX3 9DU, UK.
2. Biochemistry Department, Hippokration General Hospital, Athens 115 27, Greece.
3. First Cardiology Clinic, Athens University Medical School, Athens 115 27, Greece.
4. Milton Keynes University Hospital NHS Foundation Trust and Faculty of Life Sciences, University of Buckingham, Buckingham MK6 5LD, UK.
5. Cardiothoracic Surgery Department, Oxford University Hospitals NHS Foundation Trust, Oxford OX3 9DU, UK.
6. Sanofi Aventis Deutschland GmbH, Frankfurt D-65926, Germany.