1. Faculty of MedicineThe Chinese University of Hong KongShatin New Territories Hong Kong
2. Division of Cardiology, Department of Medicine and TherapeuticsPrince of Wales HospitalShatin New Territories Hong Kong
3. Department of Cardiothoracic Surgery, Barts Heart CentreSt Bartholomew's HospitalLondon UK
4. Department of SurgeryNorthampton General HospitalNorthampton UK
5. Department of Cardiothoracic SurgeryLiverpool Heart and Chest HospitalLiverpool UK