1. Division of Cardiology, Columbia University Medical Center, New York, NY, USA
2. Cardiovascular Research Foundation, New York, NY, USA
3. Department of Clinical and Scientific Affairs, Cardiovascular Systems, Inc., St. Paul, MN, USA
4. Division of Cardiology, UCLA Medical Center, Los Angeles, CA, USA
5. Duke Clinical Research Institute, Durham, NC, USA
6. Morristown Medical Center, Morristown, NJ, USA
7. Hôpital du Sacré-Coeur de Montréal, Université de Montréal, Montréal, Canada
8. Department of Engineering, Cardiovascular Systems, Inc., St. Paul, MN, USA
9. Metropolitan Heart and Vascular Institute, Mercy Hospital, Minneapolis, MN, USA
10. Minneapolis Heart Institute, Abbott Northwestern Hospital, Minneapolis, MN, USA
11. Piedmont Heart Institute, Atlanta, GA, USA
12. Division of Cardiology, Mount Sinai Hospital, New York, NY, USA
13. Department of Cardiology, St. Francis Hospital-The Heart Center, Roslyn, NY, USA