1. Department of Medicine, Division of Cardiology, Section of Cardiac ElectrophysiologyUniversity of California San FranciscoSan Francisco California
2. Abbott, Cardiac ArrhythmiasChicago Illinois
3. Department of Medicine, Section of Cardiology, Center for Arrhythmia Care, University of Chicago MedicineChicago Illinois
4. Department of Surgery, Section of Cardiac and Thoracic SurgeryUniversity of Chicago MedicineChicago Illinois
5. Department of Medicine, Division of Cardiology, Section of Heart FailureUniversity of California San FranciscoSan Francisco California
6. Department of Surgery, Division of Adult Cardiothoracic SurgeryUniversity of California San FranciscoSan Francisco California
7. Department of Medicine, Section of Cardiology, University of Chicago MedicineChicago IL