1. Duke Clinical Research Institute; Duke University Medical Center; Durham North Carolina
2. Division of Cardiology; Duke University Medical Center; Durham North Carolina
3. King's College London/Guy's and St. Thomas' Hospital Cardiovascular Division; Rayne Institute; London England
4. Liverpool Hospital and University of New South Wales; Sydney Australia
5. The Heart Centre; Continental Institute of Cardiovascular Sciences; Gachibowli Hyderabad India
6. Department of Cardiology; Leeds General Infirmary; Leeds England
7. Department of Cardiology; Catherina Hospital; Eindhoven The Netherlands