1. Division of Cardiovascular Surgery University of Florida Health Gainesville Florida USA
2. Department of Surgery Geisinger Health System Wilkes Barre Pennsylvania USA
3. Division of Cardiac Surgery University of Pennsylvania Philadelphia Pennsylvania USA
4. Department of Surgery Piedmont Heart Institute Atlanta Georgia USA
5. Department of Cardiovascular & Thoracic Surgery West Virginia University Charlestown West Virginia USA
6. Department of Cardiothoracic Surgery, Outcomes Research and Assessment Group Duke Clinical Research Institute Durham North Carolina USA