1. Aintree Cardiac Centre; University Hospital Aintree; Longmoor Lane Liverpool L9 7AL UK
2. Duke University Medical Center; Durham NC USA
3. Brigham and Women's Hospital; Boston MA USA
4. Department of Cardiology, Rigshospitalet; Copenhagen Denmark
5. Sahlgrenska University Hospital/Östra; Göteborg Sweden
6. University of Glasgow; Glasgow UK
7. Associazione Nazionale Medici Cardiologi Ospedalieri Research Center; Florence Italy