1. Cardiology Department; Aberdeen Royal Infirmary; Aberdeen Scotland United Kingdom
2. Institute of Cellular Medicine, Newcastle University; Newcastle-upon-Tyne United Kingdom
3. Cardiology Department; Freeman Hospital; Newcastle-upon-Tyne United Kingdom
4. Keele Cardiovascular Research Group, University of Keele; Stoke-on-Trent United Kingdom
5. Cardiovascular Institute, Manchester University; Manchester United Kingdom