1. Minneapolis Heart Institute and Minneapolis Heart Institute Foundation Abbott Northwestern Hospital Minneapolis Minnesota USA
2. Duke Clinical Research Institute Durham North Carolina USA
3. Department of Cardiovascular and Thoracic Sciences, Institute of Cardiology Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore Rome Italy
4. Department of Cardiology University of Patras Medical School Patras Greece
5. Acute Cardiac Care Unit Athens Naval and Veterans Hospital Athens Greece
6. University of Nebraska Medical Center Omaha Nebraska USA
7. Department of Cardiology Henry Ford Hospital Detroit Michigan USA