1. Department of Cardiothoracic Surgery; Morriston Hospital; Swansea UK
2. Department of Cardiothoracic Surgery; Northern General Hospital; Sheffield UK
3. Department of Cardiothoracic Surgery; Harefield Hospital; London UK
4. Department of Surgery and Cancer; Hammersmith Hospital; London UK
5. Department of Cardiac Surgery; Frontline Heart and Lung Centre; Bangalore India
6. Department of Cardiology; Morriston Hospital; Swansea UK