1. Division of Cardiology, Department of MedicineUC San Diego La Jolla CA USA
2. University of Groningen, University Medical Center Groningen Groningen The Netherlands
3. Division of Cardiology, Department of MedicineUC San Francisco San Francisco CA USA
4. Altman Clinical and Translational Research Institute (ACTRI), UC San Diego La Jolla CA USA
5. Cardiology, Department of Clinical SciencesLund University and Skåne University Hospital Lund Sweden
6. Physics DepartmentUC San Diego La Jolla CA USA
7. Physics DepartmentUC Santa Barbara Santa Barbara CA USA