1. Advocate Heart Institute Advocate Christ Medical Center Oak Lawn Illinois USA
2. Division of Cardiology, Department of Medicine University of Chicago Medical Center Chicago Illinois USA
3. Second Department of Medicine University of Toyama Toyama Japan
4. Division of Cardiology Columbia University Irving Medical Center New York New York USA
5. Section of Cardiac Surgery, Department of Surgery University of Chicago Medical Center Chicago Illinois USA
6. Cardiovascular Research Foundation New York New York USA