1. Division of Cardiology, Heart and Vascular Institute Cleveland Clinic Cleveland OH USA
2. Department of Cardiovascular Medicine Kobe City Medical Center General Hospital Kobe Japan
3. Department of Thoracic and Cardiovascular Surgery Cleveland Clinic Cleveland OH USA
4. Department of Thoracic and Cardiovascular Surgery Tohoku University Sendai Japan
5. National Kapodistrian University of Athens Medical School Athens Greece
6. Department of Cardiac Surgery, Boston's Children Hospital Harvard Medical School Boston MA USA
7. Division of Cardiovascular Medicine, Section of Heart Failure and Transplantation University of Iowa 200 Hawkins Dr Iowa City IA 52242 USA