1. Cardiovascular Division Brigham and Women's Hospital and Harvard Medical School Boston MA USA
2. Physics Department University of California Santa Barbara CA USA
3. Cardiology Department University of California San Diego CA USA
4. Division of Cardiology University of California San Francisco CA USA
5. Division of Cardiology, Department of Medicine Northwestern University Feinberg School of Medicine Chicago IL USA
6. University of Groningen, University Medical Center Groningen Groningen The Netherlands
7. Physics Department University of California San Diego CA USA