1. Department of Cardiothoracic Surgery University of Pittsburgh Medical Center Pittsburgh Pennsylvania USA
2. Department of Surgery St. Luke's University Health Network Fountain Hill Pennsylvania USA
3. Department of Cardiovascular Surgery Shizuoka Medical Center Shizuoka Japan
4. Department of Cardiothroacic Surgery, Heart and Vascular Institute University of Pittsburgh Medical Center Pennsylvania Pittsburgh USA
5. Division of Cardiology, Montefiore Medical Center Albert Einstein College of Medicine New York City New York USA