1. University of Virginia, Charlottesville, VA USA
2. Saint Elizabeth's Medical Center, Brighton, MA USA
3. Penrose St. Francis Hospital, Colorado Springs, CO USA
4. Northeast Georgia Physicians Group, Gainesville, GA USA
5. Gulf Coast Cardiothoracic and Vascular Surgeons, Ft. Myers, FL USA
6. Holy Spirit Northside Hospital, Chermside, Australia
7. Minneapolis Heart Institute, Abbott Northwestern Hospital, Minneapolis, MN USA
8. New York University School of Medicine, New York, NY USA
9. Temple University, Philadelphia, PA USA
10. Penn Presbyterian Medical Center, Philadelphia, PA USA
11. East Bay Cardiac Surgery Center, Oakland, CA USA
12. Swedish Heart and Vascular Institute, Seattle, WA USA
13. Northwestern University, Feinberg School of Medicine, Chicago, IL USA
14. Emory St. Joseph's Hospital, Atlanta, GA USA
15. St. Thomas Hospital, Nashville, TN USA
16. The Heart Hospital Baylor Plano, Plano, TX USA
17. Weill Cornell Medical College/New York Presbyterian Hospital, New York, NY USA
18. South Florida Heart & Lung Institute, Doral, FL USA
19. David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA USA
20. TriHealth Heart Institute, Cincinnati, OH USA
21. Central Maine Heart and Vascular Institute, Lewiston, ME USA
22. Lankenau Medical Center, Wynnewood, PA USA
23. Department of Cardiothoracic Surgery, Princeton Baptist Hospital, Birmingham, AL USA.