1. Department of Cardiothoracic Surgery Golden Jubilee National Hospital Clydebank Scotland
2. Duke University Durham North Carolina USA
3. The Shrewsbury and Telford NHS Trust Telford Shropshire UK
4. School of Medicine St. George's University of London London UK
5. School of Medicine University of Liverpool Liverpool UK
6. Department of Cardiothoracic Surgery Cardiocentro Ticino Lugano Switzerland