1. The Christ Hospital, Cincinnati, Ohio, USA
2. Ohio State University Medical Center, Columbus, Ohio, USA
3. Columbia University Medical Center/NewYork-Presbyterian Hospital, New York, New York, USA
4. Piedmont Heart Institute, Atlanta, Georgia, USA
5. Baylor Scott & White Health, Plano, Texas, USA
6. Cardiovascular Research Foundation, New York, New York, USA
7. St. Francis Hospital, Roslyn, New York, USA
8. University of Missouri–Kansas City, Kansas City, Missouri, USA
9. Saint Luke’s MidAmerica Heart Institute, Kansas City, Missouri, USA