1. Echocardiography Laboratory, Division of Cardiology, Mount Sinai Heart Institute Columbia University Miami Beach Florida
2. Cardiac Ultrasound Laboratory Harvard Medical School Massachusetts General Hospital Boston Massachusetts
3. Institut du Thorax, Inserm, CNRS Université de Nantes, CHU Nantes Nantes France
4. The University of Chicago Medicine Chicago Illinois
5. Cardiac Arrhythmia Service, Harvard Medical School Massachusetts General Hospital Boston Massachusetts