1. Keele Cardiovascular Research Group, Center for Prognosis Research, Keele University, Stoke-on-Trent, UK
2. Cardiovascular Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
3. Department of Medicine, Cardiology Section, VA Boston Healthcare System, Boston, MA, USA
4. Cardiovascular Research Center, University of Leicester, Leicester, UK
5. Division of Cardiology, Department of Medicine, West Virginia University, Morgantown, WV, USA
6. Department of Cardiology, Mayo Clinic School of Medicine, Rochester, NY, USA
7. Division of Cardiology, Department of Medicine, McMaster University, Hamilton, ON, Canada
8. Department of Medicine, West Virginia University, Morgantown, WV, USA
9. Department of Medicine, John H. Stronger, Jr. Hospital of Cook County, Chicago, IL, USA
10. Department of Medicine, Southport District General Hospital, Southport, UK
11. Department of Cardiology, Case Western Reserve University, Metrohealth, Cleveland, OH, USA
12. Brigham and Women's Hospital Heart & Vascular Center, Harvard Medical School, Boston, MA, USA
13. Department of Medicine, Jefferson University, Philadelphia, PA, USA