1. Department of Cardiology, Institute of Cardiovascular Medicine and Science, Liverpool Heart and Chest Hospital, England, United Kingdom (A.H., M.M., C.R., A.S., M.S., D.T., M.H., S.M., R.S., D.G.).
2. Department of Cardiology, Freeman Hospital, Newcastle upon Tyne, United Kingdom (M.D.).
3. Centro Cardiologico Monzino, Milan, Italy (S.R., A.D.R.).
4. St David’s Medical Centre, Austin, TX (A.N.).